Abstract:
A system, method, and computer program product for providing a encrypted email reader and responder is described. The method of distributing and initializing an encrypted electronic mail (email) software application for exchanging secure email, can include: obtaining by a first user a license for an email client software application program having public/private encryption; requesting by the first user that a second user download a reader/responder software application program in order to exchange encrypted email between the first user and the second user; downloading and installing the reader/responder software application program by the second user; sending an email by the second user to the first user including embedding an unencrypted public key by using a send key function of the reader/responder software application program; receiving the email from the second user by the first user, wherein the unencrypted public key is embedded in the email; responding by the first user by sending a second email to the first user, where the reader/responder software application program encrypts a message of the second email into an encrypted message using the unencrypted public key of the second user; receiving the second email by the second user with the encrypted message as an attachment from the first user into a third party email software application program, wherein the third party email software application program is different from the reader/responder software application program and the email client software application program; and opening by the second user the attachment to execute the reader/responder software application program operative to allow a user without the email client software to read and respond to encrypted email created and sent from a user having the email client software.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
   The present application is related to U.S. patent application Ser. No. 60/278,755, filed Mar. 27, 2001 “Encrypted E-Mail Reader and Responder System, Method, and Computer Program Product,” to Robert C. Ross, of common assignee to the present invention, now expired. U.S. patent application Ser. No. 09/714,997, filed Nov. 20, 2000 entitled “System, Method and Computer Program Product for Providing a Multi-User Email System,” to Robert C. Ross, of common assignee to the present invention, presently pending, and related U.S. Provisional Patent Application No. 60/166,409, filed Nov. 19, 1999 entitled “System, Method and Computer Program Product for Providing a Multi-User Email System,” to Robert C. Ross, also of common assignee to the present invention, now expired, the contents of which are incorporated herein by reference in their entirety. 

   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to electronic mail (e-mail) systems and more particularly, to encrypted e-mail systems. 
   2. Related Art 
   Electronic mail, also known as e-mail, is a widely used means of communicating between communication devices such as computers. A conventional e-mail system enables sending e-mail notes or e-mail messages much like a conventional postal letter from a source to a destination. For example, a sender could send an e-mail message including a return e-mail address to a receiver at the receiver&#39;s e-mail address on another computer through a network connecting the computers. E-mail messages provide several advantages over conventional postal mail, such as, for example, faster preparation time, faster delivery time, a simpler addressing scheme than using name, street address or post office box, city, state and zip code, and lower cost. E-mail systems can provide an efficient means of distributing information internal to and external from an enterprise or business. However, conventional e-mail systems have limitations when used in, e.g., a manufacturing plant or production environment such as, e.g., a hospital, or retail business. For example, conventional e-mail systems require that each user have a computer with which to access the e-mail system. In a production or manufacturing environment, a machine operator often will not have access to a computer. Also, it may be unsafe in certain environments to permit a worker to be distracted by e-mail while performing tasks such as, e.g., monitoring a mission critical operation, such as where a worker is operating heavy machinery or a nurse in a hospital. Limitations of conventional e-mail systems can prevent many users within organizations from, e.g., accessing important corporate information, which is most efficiently distributed over e-mail. 
   Historically, e-mail messages have included primarily text. Eventually, users were able to attach files for delivery along with an e-mail textual message. Such attached files are often called “attachments.” Many e-mail systems support attaching multiple documents to an e-mail message. Unfortunately, when an e-mail user desires to forward an attachment, the attachment is conventionally forwarded along with the message containing it causing the forwarded e-mail with attachment to be encapsulated within the new e-mail. 
   One type of e-mail system is a client/server e-mail system. The e-mail system can use a centralized post office box that resides on a server somewhere on the network to which client e-mail user computers are attached. The post office box can be used, e.g., to store a message from a sender which can then forward the message later to a temporarily disconnected addressed receiver. The centralized post office can also permit messages to be centrally backed up on a periodic basis. With a client/server e-mail system, a portion of the e-mail generation program can reside on a client&#39;s computer (the computer of the sender or receiver), and another portion of the e-mail system can reside on a server computer. E-mail application software can run on a variety of operating systems and computer system platforms. Conventionally, e-mail messages are stored on the central server computer and are accessed via the client user computers. 
   Another type of client/server e-mail system is known as “groupware.” Groupware enables functions in addition to the communication capability of e-mail including, for example, project management, location independent cooperation and information accessibility links. 
   Examples of e-mail systems include, for example, Lotus cc:Mail available from IBM, Outlook, Exchange, and MS Mail available from MICROSOFT of Redmond, Wash., USA, PROFS and OFFICEVISION available from IBM of Armonk, N.Y. USA, All-In-One from Compaq of Houston, Tex., USA, online service provider integrated e-mail systems such as, e.g., that provided by AMERICA ONLINE (AOL) of Vienna, Va., USA, the Internet Protocol&#39;s Simple Mail Transfer Protocol (SMTP), and various Internet based e-mail systems such as those available from JUNO and NETZERO. Examples of groupware include Lotus Notes available from IBM, Exchange available from MICROSOFT, Collabra Share available from NETSCAPE, and Groupwise available from NOVELL. 
   Early e-mail systems sent messages to users within an organization known as an intranet system, with little consideration taken to interacting with other e-mail systems or networks. An intranet is a term often used to describe a stand alone network or group of networks which includes a related group of senders and receivers, such as, for example, the employees of a commercial company. 
   Some intranet e-mail systems are equipped to inter-operate with other e-mail systems. Computers coupled by a network communicate by using communication software programs which in turn use a communication language or “protocol.” Some e-mail systems are implemented using a so-called “open systems” communications method such as the transmission control protocol/internet protocol (TCP/IP) suite of protocols. The TCP/IP protocol suite includes the SMTP e-mail functionality already mentioned. 
   An internet (i.e. with a lower case “i”) is a network which couples two separate networks to one another. The global Internet (i.e. with a capitalized “I”) is an internet that grew out of a U.S. Defense Advanced Research Projects Agency (DARPA) project. The Internet originally served a largely technical audience composed of the military, government agencies, and academic researchers and scientists. The original goals of the project were to allow researchers to share computing resources and to exchange information, regardless of their locations, and to create a resilient, fault-tolerant wide area network (WAN) for military communications. The global Internet implements communication using the TCP/IP communications protocols. 
   On-line service providers originally provided e-mail system access to individuals via modem connections. On-line service providers include, for example, American On Line (AOL), CompuServe, and Prodigy. Online services traditionally created offerings targeted toward home computer users. These providers often provided proprietary e-mail systems to connect their users to one another. In time, users on proprietary on-line services, were able to send messages to users on other e-mail services via the Internet. 
   During the mid-1990&#39;s, commercial enterprises and individuals increasingly discovered the benefits of being connected to the Internet, eventually creating a mass-market phenomenon. Today, although access is limited in some areas, most countries have ties to the Internet. Thus, the Internet has enabled widespread, standardized intercommunication between users of disparate e-mail systems. 
   Small and medium sized businesses have many users, which do not have access to a computer with which to send and receive e-mail. Workers in various professions including, e.g., healthcare workers in a hospital and retail, because of their jobs, may not have access to conventional email. It is desirable that all employees of a business have access to e-mail resources for such purposes as, e.g., for efficient distribution of information to employees from an employer. In many cases, it can be desirable that the employer not be required to purchase a computer for use by each of the employees. It is also desirable that the employer be able to filter out any junk e-mail, commonly known as “spam,” being sent to the employees. It is also desirable that employees such as, e.g., in a retail business, production, or operations such as a hospital, not be permitted to access their e-mail at all times in order to maintain high worker productivity. 
   Conventionally, when a sending user of an e-mail desires to send an encrypted e-mail message to a receiving user, unfortunately, the sending and receiving users must either be on compatible e-mail systems or must go through complex set up and configuration procedures prior to sending the encrypted e-mail message. Conventional e-mail systems can be complex to configure. 
   Conventional e-mail systems lack standardization in handling of encryption. 
   Thus, what is needed in an improved e-mail system that allows for the encryption, sending, receiving and decryption of e-mail in a heterogeneous network environment. 
   SUMMARY OF THE INVENTION 
   A method, system, and computer program product are provided that enable receiving users on a different e-mail system than a sending user to read and respond to encrypted email. 
   In an exemplary embodiment of the present invention a reader-responder module can allow a receiving user to read and respond to an encrypted e-mail created by a sending user using a different type of e-mail system than the e-mail system used by the receiving user. 
   In an exemplary embodiment, the receiving user, using the reader-responder module, can be provided with a sub-set of the functionality of the sending user&#39;s e-mail system. In an exemplary embodiment, the sub-set of functionality can include reading messages from users of the sending user&#39;s e-mail system. In an exemplary embodiment, the sub-set of functionality can include sending messages to users of the sending user&#39;s e-mail system, such as, e.g., the sending user. 
   In an exemplary embodiment, use of the reader-responder module by the receiving user can be allowed for no fee. 
   Advantageously, the receiving user, in one exemplary embodiment, in exchange for a transaction amount, can be provided with the full set of functionality of the sending user&#39;s e-mail system. 
   In another exemplary embodiment, a method, system, and computer program product can be provided that can enable a receiving user of a first e-mail system to read and respond to an e-mail sent from a sending user, where the e-mail was created on a second e-mail system, and where proprietary features of the second e-mail system are provided to the receiving user. 
   In an exemplary embodiment, the proprietary features are encryption features. In an exemplary embodiment, the encryption features support a 128 bit public/private encryption system. In an exemplary embodiment of the present invention a reader-responder module can allow the receiving user to read and respond to the e-mail created by the sending user on the second e-mail system. 
   In an exemplary embodiment, the receiving user, using the reader-responder module, can be provided with a sub-set of the functionality of the second e-mail system. In an exemplary embodiment, the sub-set of functionality can include exchanging messages with users of the second e-mail system. In an exemplary embodiment, the sub-set of functionality can include creating and sending messages to users of the second e-mail system. 
   In an exemplary embodiment, use of the reader-responder module by the receiving user can be provided for a nominal, or no fee. 
   Advantageously, the receiving user, in one exemplary embodiment, in exchange for a transaction amount, can be provided with the full set of functionality of the second e-mail system. 
   In an exemplary embodiment of the present invention, a method of distributing and initializing an encrypted electronic mail (email) software application for exchanging secure email, includes the steps of: obtaining by a first user a license for an email client software application program having public/private encryption; requesting by the first user that a second user download a reader/responder software application program in order to exchange encrypted email between the first user and the second user; downloading and installing the reader/responder software application program by the second user; sending an email by the second user to the first user including embedding an unencrypted public key by using a send key function of the reader/responder software application program; receiving the email from the second user by the first user, wherein the unencrypted public key is embedded in the email; responding by the first user by sending a second email to the first user, where the reader/responder software application program encrypts a message of the second email into an encrypted message using the unencrypted public key of the second user; receiving the second email by the second user with the encrypted message as an attachment from the first user into a third party email software application program, wherein the third party email software application program is different from the reader/responder software application program and the email client software application program; and opening by the second user the attachment to execute the reader/responder software application program operative to allow a user without the email client software to read and respond to encrypted email created and sent from a user having the email client software. 
   In one exemplary embodiment, the method further comprises: viewing by the second user the encrypted message using the reader/responder software application program including decoding the encrypted message using a private key for the second user. 
   In another exemplary embodiment, the method further comprises: saving information about the first user into an address book database along of the second using along with an unencrypted public key for the first user. 
   In yet another exemplary embodiment of the present invention, the method further comprises: creating a new secure email including an encrypted message by the second user to send to at least one of the first user and any other user of the email client software application program to which the second user has emailed a public key and from which the second user has received a response email. 
   In another exemplary embodiment, the email client software application program can use at least 128-bit public/private encryption. 
   In another exemplary embodiment of the present invention, a data processing system operative to distribute and initialize an encrypted electronic mail (email) software application for exchanging secure email, can include: a license module operative to obtain by a first user a license for an email client software application program having public/private encryption; a request module operative to request by the first user that a second user download a reader/responder software application program in order to exchange encrypted email between the first user and the second user; a download module operative to download and install the reader/responder software application program by the second user; a send module operative to send an email by the second user to the first user including a send key function module of the reader/responder software application program operative to embed an unencrypted public key; an email receiver module operative to receive the email from the second user by the first user, wherein the unencrypted public key is embedded in the email; a response module operative to respond by the first user by sending a second email to the first user, wherein the reader/responder software application program includes an encryption module operative to encrypt a message of the second email into an encrypted message using the unencrypted public key of the second user; a receipt module operative to receive the second email by the second user with the encrypted message as an attachment from the first user into a third party email software application program, wherein the third party email software application program is different from the reader/responder software application program and the email client software application program; and execution module operative to open by the second user the attachment to execute the reader/responder software application program including a reader responder module operative to allow a user without the email client software to read and respond to encrypted email created and sent from a user having the email client software. 
   In yet another exemplary embodiment of the present invention, a data processing system for distributing and initializing an encrypted electronic mail (email) software application for exchanging secure email, can include: means for obtaining by a first user a license for an email client software application program having public/private encryption; means for requesting by the first user that a second user download a reader/responder software application program in order to exchange encrypted email between the first user and the second user; means for downloading and installing the reader/responder software application program by the second user; means for sending an email by the second user to the first user including means for embedding an unencrypted public key by using a send key function of the reader/responder software application program; means for receiving the email from the second user by the first user, wherein the unencrypted public key is embedded in the email; means for responding by the first user by sending a second email to the first user, wherein the reader/responder software application program includes means for encrypting a message of the second email into an encrypted message using the unencrypted public key of the second user; means for receiving the second email by the second user with the encrypted message as an attachment from the first user into a third party email software application program, wherein the third party email software application program is different from the reader/responder software application program and the email client software application program; and means for opening by the second user the attachment to execute the reader/responder software application program including means for allowing a user without the email client software to read and respond to encrypted email created and sent from a user having the email client software. 
   In another exemplary embodiment of the present invention, a computer program product embodied on a computer readable media having program logic stored thereon, the computer program product operative to distribute and initialize an encrypted electronic mail (email) software application for exchanging secure email, the product including: program code means for enabling a computer to obtain by a first user a license for an email client software application program having public/private encryption; program code means for enabling the computer to request by the first user that a second user download a reader/responder software application program in order to exchange encrypted email between the first user and the second user; program code means for enabling the computer to download and install the reader/responder software application program by the second user; program code means for enabling the computer to send an email by the second user to the first user including program code means for enabling the computer to embed an unencrypted public key by using a send key function of the reader/responder software application program; program code means for enabling the computer to receive the email from the second user by the first user, wherein the unencrypted public key is embedded in the email; program code means for enabling the computer to respond by the first user by sending a second email to the first user, wherein the reader/responder software application program includes program code means for enabling the computer to encrypt a message of the second email into an encrypted message using the unencrypted public key of the second user; program code means for enabling the computer to receive the second email by the second user with the encrypted message as an attachment from the first user into a third party email software application program, wherein the third party email software application program is different from the reader/responder software application program and the email client software application program; and program code means for enabling the computer to open by the second user the attachment to execute the reader/responder software application program including program code means for enabling the computer to allow a user without the email client software to read and respond to encrypted email created and sent from a user having the email client software. 
   Further features and advantages of the invention, as well as the structure and operation of various embodiments of the invention, are described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers generally indicate identical, functionally similar, and/or structurally similar elements. The drawing in which an element first appears is indicated by the leftmost digits in the corresponding reference number. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The foregoing and other features and advantages of the invention will be apparent from the following, more particular description of a preferred embodiment of the invention, as illustrated in the accompanying drawings. 
       FIG. 1A  is a block diagram of a distributed client/server e-mail system; 
       FIG. 1B  is a block diagram of an exemplary system depicting an e-mail application program running on a computer hardware and operating system platform; 
       FIG. 2  depicts a conventional e-mail; 
       FIG. 3  is an example embodiment of a multi-user shared e-mail system according to the present invention; 
       FIG. 4  depicts an exemplary computer system of the present invention; 
       FIG. 5  depicts an exemplary embodiment of a user interface of the multi-user e-mail system of the present invention; 
       FIG. 6  depicts an exemplary embodiment of a personal file folder system of the present invention; 
       FIG. 7  depicts an exemplary embodiment of a read receipt report according to the present invention; 
       FIG. 8A  depicts an exemplary setup process of a public key infrastructure (PKI) using a public and a private key; 
       FIG. 8B  depicts a exemplary embodiment of an improved setup process for configuring public and private keys according to the present invention; 
       FIG. 8C  depicts an exemplary embodiment of a source code view of an email including an automatic embedded public key according to the present invention; 
       FIG. 9  depicts an exemplary embodiment of a graphical user interface illustrating a reader-responder module of the present invention being used to send the key from one user to another in order to enable sending encrypted e-mail; 
       FIG. 10  depicts an exemplary embodiment of a graphical user interface illustrating an address book of a reader-responder module populated with users to which an e-mail can be sent for the user of the reader-responder module; 
       FIG. 11  depicts an exemplary embodiment of a graphical user interface illustrating an email creation window of an exemplary embodiment of the reader-responder module of the present invention; and 
       FIG. 12  depicts an exemplary embodiment of a flow diagram illustrating how users could use a reader-responder module according to the present invention to exchange e-mail. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   A preferred embodiment of the invention is discussed in detail below. While specific implementations are discussed, it should be understood that this is done for illustration purposes only. A person skilled in the relevant art will recognize that other components and configurations may be used without parting from the spirit and scope of the invention. 
   Overview of the Invention 
   In many production, retail, healthcare, hospital, manufacturing or other environments, workers do not have access to a computer and e-mail, and at scheduled times go to a break room for a break. The present invention is directed to a system, method and computer program product that enables multiple users to access a single shared computer to send, receive and store e-mail messages. The system can be used continually in real-time working environment. 
   In one embodiment of the invention, the multiple user, shared single computer e-mail system permits these multiple users to view the computer and through a user interface identify whether new e-mail has arrived for any of the users. 
   In one embodiment, the users can use a touchscreen to identify themselves to the system and the system can then require entry of a password to authenticate the user. Alternatively, a conventional display monitor can be used for output of status information and a mouse or other pointing device or keyboard or other device can be used for input. 
   In another embodiment, the system can through its user interface identify a priority level of newly received e-mail, to prioritize which of the multiple users should gain access to the shared computer first. In one embodiment, the priority level can be identified by, e.g., providing a colored representation as to the urgency of the e-mail, such as, e.g., a colored or blinking name or button, or alphanumeric or other indication of priority such as, e.g., a ranked list. 
   In an embodiment of the invention, the user with the highest priority could then access the shared e-mail system first. The user with the highest priority e-mail message can then select to open his or her e-mail. 
   In one embodiment of the invention, a user can select to open the user&#39;s name by, e.g., using a mouse, key or highlighting a name or button with a cursor. In an embodiment, the user can then be prompted to provide authentication information such as, e.g., a password and/or company badge, to gain access to that user&#39;s personal e-mail environment. 
   In one embodiment of the invention, a user&#39;s personal e-mail environment can include, e.g., an inbox, an outbox, and at least one user definable file folder into which received messages can be stored. In an embodiment of the invention, the system can store messages in file folders named by sender of the message or can permit the user to provide another name for the folder such as “personal.” In one embodiment of the invention, the file folders can include different security features such as, e.g., passwords for access to the specific file folder. 
   An encryption feature can be used to encrypt and decrypt the contents of e-mail messages to prevent unauthorized access to the contents of a message. In one embodiment, a public key can be automatically sent with an email. The public key can be included at the top of an email in one embodiment. Advantageously, to exchange public keys, two users can send emails to one another. 
   In one embodiment of the invention, a first group including a first subset of all users can use a first single shared computer and a second group including a second subset of all users can use a second single shared computer. 
   In another embodiment of the invention, a banner can be included onscreen to display advertising or other relevant information to users of the shared e-mail system. Advantageously, the banner can be used, e.g., to display advertising information which can be used, e.g., to offer the e-mail system for free or a discount to businesses. 
   The shared e-mail system can include other useful features such as, e.g., a dictionary for spellcheck, a thesaurus, a grammar checker, multiple standard replies, or standard reply lists (such as, e.g., an informal reply, a business or formal reply), address book for selecting recipients, special text viewing (e.g., permitting viewing HTML or text), smart names (e.g., permitting entry of letters of a name causing, e.g., lookup of one or more addressbook entries having those letters, a list of names, or the addressbook interface itself by a function key combination), user selectable function keys (e.g., permitting a user to assign particular functions to key combinations such as, e.g., Alt-k to bring up the address book), a memo feature (i.e., enabling preparing brief memos to oneself). 
   In another embodiment of the invention, a user can access the user&#39;s e-mail environment from the Internet&#39;s world wide web. In one embodiment, storage of the user&#39;s e-mail environment is mirrored to a server on the world wide web and is kept in synchrony. In one embodiment, a user from the web interface can send, receive, store in folders, move and delete messages. In one embodiment of the invention, the e-mail system can use a version of the standard POP3 mail application modified for the specific features of the shared e-mail system. 
   The present invention can also include human resource features. For example, in one embodiment of the invention, a user can clock in and clock out via the system to provide an automated timeclock. 
   Another human resource feature can permit tracking user statistics by capturing user data via the system including, e.g., the number of employees, the number of hourly employees, the number of female and males workers, hours worked, whether someone is in or out. 
   Another human resource feature of the present invention includes provision of a company wide e-mail for use in, e.g., notifying all employees of events, company policy and other announcements. The present invention, in one embodiment, can require each employee to acknowledge that they have read an e-mail (e.g., regarding a company policy) and the system can automatically compile a single record regarding all employees indicating which employees opened the e-mail and which did not. A report referred to as a read receipt report can be generated that can track which recipients have accessed a sent file. In one embodiment, the date and time of access can be tracked also. In one embodiment the report can be continually updated. 
   The present invention provides several other features applicable to general e-mail systems. For example, the present invention can include an e-mail system having a function that automatically removes greater-than (“&gt;”) signs that other e-mail systems could have embedded into forwarded e-mails. 
   Another e-mail feature includes in the window interface that presents the contents of an open e-mail, a graphical display indicating a hierarchy of forwarded e-mails and attachments. Advantageously, the graphical display enables forwarding of only an included forwarded e-mail or attachment. 
   Another embodiment of the present invention can filter e-mail obtained from a list of internet locations (e.g., addresses or domain names), which can be maintained by an administrator (i.e., in one embodiment of the invention for a single user version, the administrator can be the user). In one embodiment of the invention, the filter can refuse acceptance of e-mails from those designated locations by maintaining a so-called “no spam” list. The filter can be used to block other e-mail based on criteria set by the administrator, such as, e.g., limiting the size of an e-mail or attachments. In one embodiment of the invention, incoming e-mail can be queued and can be forwarded to the recipient e-mail user, only at a particular time (such as, e.g., break time, lunch time, or after hours). Advantageously, this feature can prevent employees from sneaking off at non-break times to check e-mail. In another embodiment of the invention, access to a user&#39;s e-mail box can be restricted to only particular times of the day, avoiding employee temptation to check e-mail. 
   In another embodiment of the invention, sending of a message can be delayed to a given time by inputting a send date and time upon creation of the e-mail. Advantageously, the delayed send e-mail feature can enable earlier entry of e-mail birthday greetings to be sent on an employee&#39;s birthday. 
   In another embodiment of the invention, a feature can be provided to store e-mail in a folder which can default to be titled by the sender&#39;s e-mail userid (i.e., also commonly referred to as username, screenname, or e-mail address). The user can be permitted to modify the folder name such as, e.g., to replace it with the sender&#39;s company name, or department name, or other designation for the folder such as, e.g., “personal,” or “confidential.” 
   In another embodiment of the invention, the system can automatically timeout and close a user&#39;s e-mail if no action has been made for a selectable period of time, to prevent unauthorized access to the user&#39;s e-mail environment. 
   An Exemplary Embodiment of the Invention 
     FIG. 1A  illustrates a block diagram of e-mail system environment  100  including an exemplary distributed client/server computer e-mail system. E-mail system environment  100  includes a sending user  102 . Sending user  102  sends an e-mail message to a receiving user  104 . Sending user  102  creates the e-mail on a client computer  106 . Client computer  106  transmits the e-mail from sending user  102  to receiving user  104  on a client computer  110 . An e-mail message may be created via mail client  116  of client computer  106  and may be sent via interaction with a mail server  118  on a server  112  over a communications network  114 . An e-mail  200 , described further below with reference to  FIG. 2 , in being sent from its source, i.e., sending user  102 , can travel over communications network  114 , and can pass through other computers (i.e., not shown) enroute to its final destination, client computer  110  for receipt by receiving user  104 . In one embodiment of the invention, communications network  114  includes an intranet. In another embodiment, communications network  114  includes the global Internet. It would be apparent to a person having ordinary skill in the art that the features of the present invention can be used in alternative e-mail system environments and architectures. 
     FIG. 1B  depicts an exemplary computer environment  120  for client computer  106 . It would be apparent to a person having skill in the art that environment  120  could also depict client computer  110  and server  112 . Environment  120  includes hardware  122 , operating system  124  and application programs  126 ,  128  and  130 . Operating system  124  provides a uniform interface of application programming interfaces (APIs) to applications  126 ,  128  and  130  for access to hardware  122 . An exemplary application  126  is an e-mail application program, mail program  132 . Mail program  132  is an example of mail client  116  and mail server  118 . Alternatively, a mail program  134  can be included as part of operating system  124  to provide e-mail functionality to applications  126 ,  128  and  130 . 
   Referring back to  FIG. 1A , mail client  116  can include an authentication input module which can accept a password from user  102  to validate that user  102  is authorized to access the e-mail account of user  102 . Authentication input module  108  can interact with an authentication server module  136  of mail server  118  to determine whether user  102  is authorized to access the personal e-mail box of user  102 . After authenticating user  102 , authentication server module  136  can provide user  102  access via a storage module  138  to the mailbox of user  102  of e-mail storage  140 . 
     FIG. 2  illustrates an example of a conventional e-mail  200 . E-mail  200  includes various data components. Example data components included in e-mail  200 , are creation information  202 , a body  204 , address information  206 , and a subject  208 . 
   In an example embodiment, creation information  202  can include, e.g., the date and time e-mail  200  was sent from sending user  102  to receiving user  104 . The body  204  of e-mail  200  can include, e.g., a text portion  210  and embedded objects  212 . Embedded objects  212  can include, e.g., attachments  214 . Other embedded objects  216  can include, e.g., bit map images, graphics objects, executable programs, compressed text and applets. Embedded objects  216  can also include a forwarded e-mail  200 . Address information  206  can include the e-mail address of sending user  102  and receiving user  104  of e-mail  200 . Attachments  214  can also include other embedded objects  212 . Subject  208  can include a brief description of the contents of e-mail  200 . It would be apparent to persons skilled in the art that e-mail  200  can include a subset of the listed components. 
     FIG. 3  illustrates an example embodiment of an implementation of the present invention, including e-mail system  300 . E-mail system  300  can include a computer  302  in communication with users  304 ,  306  and  308 . Computer  302  includes a multi-user mail system  310 . In a preferred embodiment, multi-user mail system  310  is a Point Clear e-mail system available from Point Clear.net, Inc. a wholly owned subsidiary of XANTE Corporation of Mobile, Ala., U.S.A. Email system  310  can include, in one embodiment, a prioritization module  312 , an authentication module  314 , a storage module  316 , an e-mail storage module  318 , an in queue  326  and an out queue  328 . 
   Since multi-user mail system  310  runs on a single computer  302 , only one of users  304 ,  306  and  308  can access computer  302  at one time. Access to computer  302  can be prioritized using prioritization module  312 . Prioritization module  312  can indicate which of users  304 ,  306  and  308  should have priority to access computer  302  and multi-user mail system  310 . In one embodiment, the urgency of e-mail messages can be indicated as a form of priority. For example, e-mails from a particular e-mail address could trigger a higher priority, such as, e.g., an e-mail from the CEO of a company. Other indications of priority could include, receipt of an e-mail message, versus having no new messages. Informally, a supervisor could have a higher priority than a line worker who, in turn, could have higher priority than a part-time worker. 
   If the highest priority user is user  304  then user  304  can proceed to authenticate using authentication module  314  by, e.g., entering a password, to access a storage environment  320 . Assuming the proper authentication information is provided, then storage module  316  can provide user  304  access to storage environment  320  of e-mail storage  318  via storage module  316 . 
   When user  304  sends an e-mail to another user, the e-mail can be routed via an out queue  328  to its final destination. 
   When user  304  receives an e-mail message from another user, the e-mail can be queued at in queue  326 . 
   In one embodiment, in queue  326  and out queue  324  can be used to delay sending or receipt and for filtering operations. 
   The present invention enables status of multiple users&#39; e-mail accounts to be monitored and accessed from a single computer where each user is identified on a name screen. See  FIG. 5  below depicting diagram  500  of an exemplary embodiment of a multi-user interface of the present invention. The exemplary embodiment of  FIG. 5  depicts a graphical user interface (GUI) application, applet, or browser interface to the multi-user email system of the present invention. An exemplary implementation embodiment of the multi-user email system of the present invention is the PointClear™ system available from PointClear.net, Inc., a wholly owned subsidiary of XANTE Corporation of Mobile, Ala., U.S.A. 
   In one embodiment, the single shared computer multiple e-mail system supports greater than 7 users and up to 64 users on the single computer. In another exemplary embodiment, 4 columns of 16 users can be displayed using the multi-user interface of the multi-user email system of the present invention as shown in diagram  500 . 
   In one embodiment, a system administration tool can be used to configure each e-mail account at a company. 
   In one embodiment, the name screen is the default screen for the multiple e-mail account system listing e-mail accounts by user name associated with the computer. 
   In one embodiment, a time clock feature is included providing an electronic time clock. For example, a system administrator can identify time clock employees, in one embodiment, and can setup specific features that need to be logged such as, e.g., log-in, log-out, overtime, human resource reporting and supervisor warnings. 
   In another embodiment, if an e-mail environment window is left open and is idle for a specified time then the individual&#39;s e-mail window logs out of the system. Log out can be based on, e.g., passage of a time duration or other criteria. This feature prevents unauthorized access to an account by public viewing after a user leaves the system computer without logging out. 
   In one embodiment, the system of the present invention can be provided for a discount such as, e.g., free, if users are willing to watch advertising. Free evaluation use could also be provided. With a free evaluation use, a date is identified after which use is disabled. After completion of particular criteria, access can be re-enabled preserving all file folders. In one embodiment, an advertising banner can be included and can be placed in a fixed location. Advertising, in one embodiment, can be provided from In another embodiment, an address book importer can be provided to import address listings from other application programs. 
   In one embodiment of the invention, attachments of all types can be accessible for adding to an e-mail, saving from an e-mail, deleting from an e-mail, executing from the e-mail, and forwarding as an e-mail. An e-mail can also be forwarded as an attachment. Where an e-mail has several attachments, a user can select from multiple attachments by highlighting selected attachments for forwarding and the selected attachments only can be forwarded, in one embodiment. 
   In one embodiment, a spam eliminator can maintain a dynamic list of e-mail addresses that can be identified as sources from which e-mail is not accepted. The spam eliminator is a filter which can be based on e-mail address, domain name, or other identifier. 
   In one embodiment, online help can be provided. 
   In another embodiment, the address book can include groups of e-mail users. 
   In another embodiment, e-mail folder security can be provided restricting access to stored folders to only users entering authentication criteria such as, e.g., a password associated with that folder. 
   In another embodiment a spell checking feature can be provided. 
   In another embodiment, messages can be marked as urgent, (also referred to as hot, or hot mail), or can be identified as a priority level by inclusion in their body or otherwise of identifying priority information. In one embodiment, receipt of an urgent e-mail can initiate an urgency signal such as, e.g., a visual, graphical, or audio indication. Diagram  500  of  FIG. 5 , for example, depicts new mail via an envelope icon  512 ,  508 . Urgency of the emails waiting a review by the multiple users can be indicated by, e.g., color coding such as, e.g., red  506  for the highest urgency, yellow  510  for intermediate urgency and white  502  for the lowest priority. Alternatively, other colors can be used. Alternatively an audio, visual, iconic, numeric, alpha numeric, or other indication of priority can be provided. Also, a higher priority can trigger, e.g., an audio alarm, or a wireless alertor page. No new mail  504  can be indicated on the multi-user interface as well. 
   In another embodiment of the present invention, inclusion of specific words or phrases in an e-mail, or subject portion, for example, can be recognized by consulting a library of words and phrases, and prior to receiving the e-mail containing the words or phrases, the e-mail can be rejected. An automatic response can be initiated to the sender of the message indicating what has happened, or even warning the sender of consequences of sending such e-mail. 
   In another embodiment of the invention, delayed message delivery can permit identification of a delivery date and time for delivery of the e-mail message. 
   In another embodiment of the present invention, an e-mail account can be set up to auto forward any received e-mails to another e-mail address. In another, an autoreceipt feature can be enabled by a sender of an e-mail to verify that a receiver has, e.g., accessed, received, or opened e-mail. In an exemplary embodiment, a read receipt report can be displayed such as, e.g., the read receipt report as shown in  FIG. 7  is described further below. 
   In another embodiment of the present invention, an encryption feature can enable entry of a personal encryption key between sender and receiver to control access to an e-mail. Multiple algorithms can be supported for encryption. Advantageously, in one embodiment, as new algorithms are developed, legacy algorithms can continue to be supported. Users of earlier revisions of the e-mail system set up with a first algorithm, can continue to use the first algorithm even when the program defaults to, e.g., a tenth algorithm. In one exemplary embodiment, a user&#39;s public key can be automatically generated by the present invention. In one embodiment, a public key can be automatically embedded in an email message that is being sent. The reader is referred to  FIGS. 8A ,  8 B, and  8 C for examples of a conventional public key infrastructure, exchange of public keys according to the present invention, and an email indicating a public key embedded at the top of the email shown when viewing the source code according to the present invention, respectively. Advantageously a user need not go through a complicated set up process as is conventionally required. 
   In an embodiment of the invention, when composing an e-mail and filling in the destination address field, for example, a list of names can be parsed as potential e-mail recipients based on the keys depressed by the sender of the e-mail. The more characters that are typed, in one embodiment, the narrower the selection of names. Pressing a key combination can list all possible candidates for the keys pressed, from which the user can select. 
   In an embodiment of the invention, a key or key combination can be defined by a user to perform tasks. Using this feature, a user can set desired actions for, e.g., function keys, and alternate and control key combinations. 
   In an embodiment of the invention, a user can insert a voicemail into an e-mail while composing the e-mail. 
   In an embodiment of the invention, a user can insert an audio/video recording into an e-mail. 
   In an embodiment of the invention, personal reminder memos can be created in the e-mail user environment. 
   In another embodiment, when an e-mail is received, the sender of the e-mail, automatically, or through prompting, can be added to the address book. In another embodiment, the carbon copy list can similarly be added to the address book. 
   In another embodiment of the invention, where an e-mail includes inserted greater than signs (“&gt;”), a feature can be included that deletes any greater than symbols from the beginning of a string. This character is often added by an e-mail system when forwarding an e-mail message. The “&gt;” is a default character in many e-mail systems, but can be eliminated or changed to another character in some systems. Thus, in another embodiment, the character to be removed can be designated. 
     FIG. 6  depicts a user interface illustrating an exemplary embodiment of a personal filing system  600  of the present invention. The personal filing system  600  can include a user&#39;s e-mail environment including a file cabinet  602 . The file cabinet  602  is a folder identified as a location to create personal nested sub-folders into which a user can organize incoming and outgoing e-mail. The user, in one embodiment, can set the properties for sending and receiving e-mail related to the file cabinet. For example, all e-mails sent by a sending user can be automatically stored in a personal folder in the sending user&#39;s personal file cabinet  600 . In an exemplary embodiment, the email stored in a file folder named by the recipient&#39;s e-mail address or user name. In an exemplary embodiment, a read receipts continually updateable file can be stored in an assigned folder. A user can also modify the folder into which the e-mail can be stored upon sending. Similarly, for an email received from a sender at a recipient, the e-mail can be stored automatically into an assigned folder such as, e.g., a folder that can be set by the sending user&#39;s e-mail address or user name. In an exemplary embodiment, upon receiving an email, a recipient by selection of a single button can cause the email to be automatically stored in the assigned personal folder. 
   In an embodiment of the invention, a user&#39;s e-mail configuration can be mirrored on a server that can be accessible from a web browser, or a remote version of the mail system. This interface can give a user access to the user&#39;s address book and all the user&#39;s folders as if the user were sitting in front of the multi-user shared e-mail system computer. The user that is sending and receiving e-mail, can also be viewed, by the recipients of the e-mail, as being at the recipient&#39;s desks. 
   The present invention is computer platform independent. Client computer  106  in a preferred embodiment is a personal computer (PC) system running an operating system such as Windows Mac/OS, or a version of UNIX. However, the invention is not limited to these platforms. Instead, the invention can be implemented on any appropriate computer system running any appropriate operating system, such as, for example, Solaris, Irix, Linux, HPUX, OSF, Windows, Windows NT, OS/2, Mac/OS. In one embodiment, the present invention is implemented on a computer system operating as discussed herein. In another embodiment, the present invention can be implemented on hardware such as a handheld device, such as, e.g., a two-way pager, a cellular phone, a digital phone, a watch, a wireless device, a laptop, notebook or sub-notebook computer, and other computer type device such as, e.g., a micro-computer, a mini-computer and a mainframe computer. 
     FIG. 4  depicts an exemplary client computer  106  computer system. Other components of the invention, such as client computer  110 , computer  302 , and/or server computer  112 , could also be implemented using a computer such as that shown in  FIG. 4 . 
   The computer system  106  can include one or more processors, such as processor  402 . The processor  402  can be coupled to a communication bus  404 . 
   Client computer  106  can also include a main memory  406 , preferably random access memory (RAM), and a secondary memory  408 . The secondary memory  408  can include, for example, a hard disk drive  410  and/or a removable storage device  412 , representing a floppy diskette drive, a magnetic tape drive, a compact disk drive, etc. The removable storage device  412  can read from and/or write to a removable storage unit  414  in a well known manner. 
   Removable storage unit  414 , can also be referred to as a program storage device or a computer program product, represents a floppy disk, magnetic tape, compact disk, etc. The removable storage unit  414  can include a computer usable storage medium having stored therein computer software and/or data, such as an object&#39;s methods and data. 
   Client computer  106  can also include an input device such as, e.g., a mouse  416  or other pointing device such as a digitizer, and a keyboard  418  or other data entry device. Client computer  106  can also include an output device such as display  418 , which in one embodiment can be a touch enabled monitor. Client computer  106  can also include, e.g., a network interface card  422  and/or a modem  424  which can be used to access network  114 . 
   Computer programs (also called computer control logic), including object oriented computer programs, can be stored in main memory  416  and/or the secondary memory  418  and/or removable storage units  414 , also called computer program products. Such computer programs, when executed, enable the computer system  106  to perform the features of the present invention as discussed herein. In particular, the computer programs, when executed, enable the processor  402  to perform the features of the present invention. Accordingly, such computer programs represent controllers of the computer system  106 . 
   In another embodiment, the invention can be directed to a computer program product comprising a computer readable medium having control logic (computer software) stored therein. The control logic, when executed by the processor  402 , can cause the processor  402  to perform the functions of the invention as described herein. 
   In yet another embodiment, the invention can be implemented primarily in hardware using, for example, one or more state machines. Implementation of these state machines so as to perform the functions described herein will be apparent to persons skilled in the relevant arts. 
     FIG. 5  depicts an exemplary embodiment of multi-user graphical user interface (GUI)  500  including an indication of status of a plurality of different user email accounts. The GUI illustrated is a personal computer based software application program. The GUI could just have easily been a workstation application, a UNIX application, a JAVA applet, or an Internet or world wide web (“WWW” or web) browser based homepage, or applet GUI. In an exemplary embodiment, an indication of priority can be included. For example, a prioritization indication can be provided to indicate which email account should have priority. In one embodiment, a visual indication can be used. In another, an audio indication can be provided. In one embodiment, a color scheme can be used, as shown, including white record  502 ,  504 , with lowest priority. An icon  508 ,  512 , or no icon  504  can be used to indicate whether new mail has been received for one of the multi-user accounts. To provide prioritization, a yellow colored indication  510 ,  512  can stress a medium priority message. In the exemplary embodiment, a higher priority message  506 ,  508  can be stressed by coloring them red. A low priority message can be colored white. Selection of a user account by touching a touch screen, or selecting with a mouse or other input device such as, e.g., a keyboard, remote control, or cursor keys, can cause the email account environment to be opened, assuming the user can provide authentication such as, e.g., a password, a biometric, or other identification information. 
     FIG. 6  depicts an exemplary embodiment of a personal file system  600 . Personal file system  600  can include a plurality of personal folders  602 – 640  for storing sent and received emails.  FIG. 6  depicts a user interface illustrating an exemplary embodiment of a personal filing system  600  of the present invention. The personal filing system  600  can include a user&#39;s e-mail environment including a file cabinet  602 . The file cabinet  602  is a folder identified as a location to create personal nested sub-folders into which a user can organize incoming and outgoing e-mail. The user, in one embodiment, can set the properties for sending and receiving e-mail related to the file cabinet. For example, all e-mails sent by a sending user can be automatically stored in a personal folder in the sending user&#39;s personal file cabinet  600 . In an exemplary embodiment, the email stored in a file folder named by the recipient&#39;s e-mail address or user name. In an exemplary embodiment, a read receipts continually updateable file can be stored in an assigned folder. A user can also modify the folder into which the e-mail can be stored upon sending. Similarly, for an email received from a sender at a recipient, the e-mail can be stored automatically into an assigned folder such as, e.g., a folder that can be set by the sending user&#39;s e-mail address or user name. In an exemplary embodiment, upon receiving an email, a recipient by selection of a single button can cause the email to be automatically stored in the assigned personal folder. 
     FIG. 7  depicts an exemplary embodiment of an assigned read receipt folder&#39;s read receipt report  700 . Read receipt report  700  can include names  706 , and e-mail addresses  708  of recipients of the email. Upon access of the email by recipients, the read receipt report  700  can be automatically updated to include, e.g., a date and time  712  of the access, and type of access  710 . The read receipt report  700 , can provide various types of information in a record  702 . If the email has not been accessed yet, then a blank record  704  can be provided. 
     FIG. 8A  depicts a conventional public key infrastructure (PKI)  800  indicating an exemplary configuration of a user  1   802  in communication with a public/private key provider  804 . Public/Private key  804  can provide information from user  2   806  to provide communication between users  802 ,  806 . 
   A conventional process  800  as shown in  FIG. 8A  can begin with step  808 . 
   In step  808 , User  1   802  sets up an account with an encryption public/private key provider  804 . From step  808 , process  800  can continue with step  810 . 
   In step  810 , User  2   806  sets up an account with the encryption public/private key provider  804 . Suppose User  1   802  desires to send an encrypted message to User  2   806 . From step  810 , process  800  continues with step  812 . 
   In step  812 , User  1   802  must learn the public key of User  2   806  by communicating with the public/private key provider  804 , must search for User  2   806 , and must add the key information to the email address book of User  1   802  relating to User  2   806 . 
   Suppose User  2   806  also desires to send an encrypted message to User  1   802 . Process  800  continues with step  814 . 
   In step  814 , User  2   806  also must learn the public key of User  1   802  by communicating with the public/private key provider  804 , must search for User  1   802  and must add the key information to the email address book of User  2   806 , relating to User  1   802 . From step  814 , process  800  can continue with step  816 . 
   In step  816 , User  1   802  and User  2   806  can finally send encrypted messages to each other. 
   An example of a conventional system implementing the system of  FIG. 8A  is that of Microsoft Outlook Express, available from Microsoft Corporation of Redmond, Wash., U.S.A. Such conventional systems are cumbersome to operate and require extensive user customization as already detailed, unlike the present invention. For example, the Microsoft Outlook Express Help Index describes a difficult process by which the public/private key encryption features can be setup in Outlook. The following excerpt is demonstrative of the difficulty of such conventional solutions as shown in  FIG. 8A : 
   Sending Secure Messages
         As more people send confidential information by e-mail, it is increasingly important to be sure that documents sent in e-mail are not forged, and to be certain that messages you send cannot be intercepted and read by anyone other than your intended recipient.   By using “digital IDs” with Outlook Express, you can prove your identity in electronic transactions in a way similar to showing your driver&#39;s license when you cash a check. You can also use your digital ID to encrypt messages, keeping them private. Digital IDs incorporate the S/MIME specification for secure electronic mail.       

   How Do Digital IDs Work?
         A digital ID is composed of a “public key,” a “private key,” and a “digital signature.” When you digitally sign your messages, you are adding your digital signature and public key to the message. The combination of a digital signature and public key is called a “certificate.”   Recipients can use your digital signature to verify your identity and use your public key to send you encrypted mail that only you can read by using your private key. In order to send encrypted messages, your address book must contain digital IDs for the recipients. That way, you can their public keys to encrypt the messages. When a recipient gets an encrypted message, their private key is used to decrypt the message for reading.   Before you can start sending digitally signed messages, you must obtain a digital ID and set up your mail account to use it. If you are sending encrypted messages, your address book must contain a digital ID for each recipient.       

   Where Do You Get Digital IDs?
         Digital IDs are issued by independent certification authorities. When you apply for a digital ID at a certification authority&#39;s Web site, they verify your identity before issuing an ID. There are different classes of digital IDs, each certifying to a different level of trustworthiness. For more information, use the Help at the certification authority&#39;s Web site.   In order to obtain someone else&#39;s digital ID, you can request they send you digitally signed mail, or you can search the digital ID database on a certification authority&#39;s Web site. You can also search Internet directory services that list digital IDs along with other properties.       

   How Do You Verify a Digital Signature?
         With “revocation checking,” you can verify the validity of a digitally signed message. When you make such a check, Outlook Express requests information on the digital ID from the appropriate certification authority. The certification authority sends back information on the status of the digital ID, including whether the ID has been revoked. Certification authorities keep track of certificates that have been revoked due to loss or termination.       

     FIG. 8B  depicts an exemplary embodiment of an improved configuration method that configures a secure public/private key configuration method  818 . User  1   802  can send in step  824  a message to user  2   822 . In step  826 , user  2   822  can send an email to user  1   820 . Since, according to the present invention, a user  820 ,  822  can automatically have a public key be embedded in the email, the exchange shown can automatically provide public keys to the recipients of the messages. 
   Using the present invention, two users interested in exchanging public keys can perform the following steps: 
   1. Both sender and receiver can be using PointClear on their respective systems or computer(s); 
   2. User  1   802  can send a message to User  2   822 ; and 
   3. User  2   822  can send a message to User  1   802 . 
   In an exemplary implementation embodiment, the above listed steps can be performed using the PointClear e-mail program of PointClear.net, Inc., a wholly-owned subsidiary of XANTE Corporation of Mobile, Ala., U.S.A. 
     FIG. 8C  shows an exemplary embodiment of a view  828  of an email which can illustrate a public key that has been embedded for ease of providing the public key of one user to another user, for use in communicating via, e.g., an encrypted communication, according to the present invention. The view  828  is shown in a view revealing the source code of the email. 
   Overview of Reader-Responder 
   Referring briefly to  FIG. 3 , in an exemplary embodiment of the present invention, a user  304 – 308  of a first email system may wish to exchange e-mail with a user  102  of a second email system, where user  102  is not on the first email system of user  304 – 308 . If the first email system provides certain proprietary features, such as, e.g., encryption, receipt notification, etc., then conventionally the recipient user  102  on the second email system may not be able to access the email created by the sending user  304 – 308  of the first email system. Also, conventionally, users  102  and users  304 – 308  may not be able to take advantage of the proprietary features of the first email system when user  102  is not running on the first email system. 
   In an exemplary embodiment of the present invention, a reader-responder module can be used by the user  102  of the second email system, in order to allow the user  102  to read and respond to an email sent from user  304 – 308  of the first email system, taking advantage of the proprietary features of the first email system. 
   In an exemplary implementation embodiment, the reader-responder module can be a POINTCLEAR reader-responder available from Pointclear.net, Inc., a wholly owned subsidiary of the XANTE CORPORATION of Mobile, Ala., U.S.A. 
   In an exemplary embodiment, the user  304 – 308  can send a copy of the reader-responder module to the user  102 . In one exemplary embodiment, the user  304 – 308  can sent the key of the user  304 – 308  along with the reader-responder module to the user  102 . The user  102  can then install the reader-responder module on the workstation of user  102 . The user  102  can send the key of user  102  as illustrated in  FIG. 9  to the user  304 – 308  to enable the user  304 – 308  to send an email taking advantage of the proprietary functions. 
   Alternatively, the user  102  can download the reader-responder module, e.g., from a network or other computer system. Subsequently, the user  304 – 308  can send the key of user  304 – 308  to the user  102 . User  102  can then send the key of the user  102  to user  304 – 308  as illustrated in  FIG. 9 , below. 
     FIG. 9  depicts an exemplary embodiment of a graphical user interface  900  illustrating set-up of a reader-responder module of the present invention. Specifically, the reader-responder module can be used to send a key from user  102  to the user  304 – 308  in order to enable the user  304 – 308  to send an e-mail taking advantage of proprietary features of a first e-mail system (i.e., the email system of user  304 – 308 ), to the user  102  who is not on the first email system. 
   The reader is again referred to  FIG. 8C  which can now be used to illustrate an exemplary embodiment of a view  828  of an email in which a public key has been embedded for ease of providing the public key of the user  102  to the user  304 – 306  of the first email system, for use in communicating via, e.g., an encrypted communication, according to the present invention. The view  828  as illustrated, is shown in a view revealing the source code of the email. It will be apparent to those skilled in the art that alternative views of the e-mail can be provided, and can also be provided as a default view. 
   Once the reader-responder module is set up, then the user  102  can receive e-mail from users  304 – 308  of the first email system that take advantage of proprietary features of the first email system. If user  102  wishes to respond to user  304 – 308  then the user  102  can use the reader-responder module to create an e-mail as shown in  FIG. 11 . 
   In an exemplary embodiment, if the user  102  desires to send a carbon-copy to other users  304 – 308 , then the user  102  can look them up in an address book as illustrated in  FIG. 10 , as described further below with reference to  FIG. 10 . If the other users  304 – 308  are not listed in the address book, the users  304 – 308  can be added to the address book. In an exemplary embodiment, the user  102  can have the users  304 – 308  send the user  102  an email providing user  102  the keys of other users  304 – 308 , to support encryption. 
   In an exemplary embodiment, if user  102  desires to send an email to a user  104  who is not on the first email system of users  304 – 308 , then the user  102  will not be permitted to do so without first obtaining a license to the full featured version of the first email system. Once user  102  becomes a licensed user of the first e-mail system, then the user  102  can be permitted to send a copy of the reader-responder module to other users  104  which are not licensed users of the first email system. Advantageously, the ability to send a copy of a reader-responder module to non-licensed users can be an effective viral marketing approach to create interest in and to encourage licensure of the full-featured version of the first email system. 
     FIG. 10  depicts an exemplary embodiment of a graphical user interface  1000  illustrating an address book of an exemplary reader-responder module of the present invention. Specifically, the address book can be populated with users  304 – 308  to which an e-mail can be sent for the user  102  of the reader-responder module, which is not on the first email system of users  304 – 308 . 
   The user  102  although licensed to use the reader-responder module, is not a licensed user of the first email system of users  304 – 308 . Initially (assuming the user  102  has already received and installed a copy of the reader-responder module on the workstation of user  102 , and has received the key of user  304 – 308 ), the only recipients listed in the address book of user  102 , to which user  102  can send an email using the reader-responder software, is the user  304 – 306  who has sent user  102  the key of user  304 – 308 . If other users  304 – 308  send the keys of the other users  304 – 308  to the user  102 , then the names of the other users  304 – 308  can also appear on the recipients list of the address book of user  102 . 
   It is important to note, however, that in the exemplary embodiment, the user  102  can not send emails using the reader-responder module to users  104  which are not users of the first email system of user  304 – 308 . Thus, the user  102  will not be able to add users  104  to the address book of user  102  if the users  104  are not licensed users of the first e-mail system of user  304 – 308 . 
   If the user  102  becomes a licensed user of the first e-mail system of user  304 – 308 , e.g., by paying a transaction fee, then the user  102  has in fact become a user  304 – 308  and will then be able to send email to any other user  304 – 308  and can also send copies of the reader-responder module to other users  104  which are not users of the first email system of user  304 – 308 . 
     FIG. 11  depicts an exemplary embodiment of a graphical user interface illustrating an email creation window of an exemplary embodiment of the reader-responder module of the present invention. As shown, the email creation window of the exemplary embodiment can include various icons such as, e.g., a send icon that can be used to send the email; a print icon that can be used to print the email; cut/copy/paste icons that can be used as conventionally known to cut, copy or paste data from or into the email; a cut “&gt;” icon that can be used to eliminate embedded indentation characters; an attach file icon that can be used to add an attachment to the email; a recipients icon that can be used to open the reader address book as described above with reference to  FIG. 10 ; a spell check icon that can be used to spell check the e-mail message contents; a priority icon that can be used to identify the priority of the email; and a send key icon that can be used to embed a sending user&#39;s key to the email for sending along to the receiving user. Other conventional fields such as addressee, subject and body fields can be provided as well as other functions in pull-down menus and other useful functionality as will be apparent to those skilled in the relevant art. 
     FIG. 12  depicts an exemplary embodiment of a flow diagram  1200  illustrating how users could use a reader-responder module according to the present invention to exchange e-mail. 
   Flow diagram  1200  of  FIG. 12  can begin with step  1202  and can continue immediately with step  1204 . 
   In step  1204 , in an exemplary embodiment, user  304  can license an e-mail client application having proprietary features. In an exemplary embodiment, the e-mail client application can include a proprietary encryption feature. However it is important to note that alternative proprietary features could be provided according to the technique of the present invention. In an exemplary implementation embodiment the e-mail client application can be PointClear Client Software, available from PointClear Communications, at PointClear.net of Mobile, Ala., U.S.A. including a 128 bit Public/Private Key Encryption System. From step  1204 , flow diagram  1200  can continue with step  1206 . 
   In step  1206 , in an exemplary embodiment, user  304  can desire to exchange email with user  102 , who is on a different email system. Specifically, in an exemplary embodiment, user  304  can desire to exchange encrypted e-mail with the user  102 . From step  1206 , flow diagram  1200  can continue with step  1208 . 
   In step  1208 , in an exemplary embodiment, user  102  can have a different e-mail software system than user  304 . For example, if user  304  uses an e-mail software application system available from PointClear.net, and user  102  instead uses an e-mail software application system available from, e.g., Microsoft, Novell, Lotus, or any other software developer, then only a subset of features of the PointClear.net e-mail software application system might be available to the users. For example, perhaps only text-based email would be supported, because of lack of support for certain proprietary features. From step  1208 , flow diagram  1200  can continue with step  1210 . 
   In step  1210 , in an exemplary embodiment, user  304  can request that user  102  download reader/responder module application software. For example, the software can be PointClear Reader/Responder Module application software from www.pointclear.net/reader. In an exemplary embodiment, the software download can be free of charge. Product features of the PointClear Reader/Responder Module application software can provide a subset of a full-featured licensed version of a PointClear Client Application Software. From step  1210 , flow diagram  1200  can continue with step  1212 . 
   In step  1212 , in an exemplary embodiment, user  102  can download and install reader/responder module application e-mail software or system. From step  1212 , flow diagram  1200  can continue with step  1214 . 
   In step  1214 , in an exemplary embodiment, user  102  can use a “send key” program that can be included, e.g., as a function of the reader/responder module application. In an exemplary embodiment, the send key function can be used to automatically send an unencrypted public key to user  304 . From step  1214 , flow diagram  1200  can continue with step  1216 . 
   In step  1216 , in an exemplary embodiment, user  304  can receive an email from user  102  with an embedded public key and can respond as the reader/responder can automatically encrypt the e-mail message using the public key of user  102 . From step  1216 , flow diagram  1200  can continue with step  1218 . 
   In step  1218 , in an exemplary embodiment, user  102  can receive a message from user  304  into the email software of user  102  (i.e., Microsoft, Lotus, Novell, etc.). In an exemplary embodiment, the email can include a file named encryptedmessage.xmf. From step  1218 , flow diagram  1200  can continue with step  1220 . 
   In step  1220 , in an exemplary embodiment, user  102  can open the file that can automatically execute the reader/responder module application. The reader/responder module application according to an exemplary embodiment of the present invention can view an encrypted message using a private key of User  102  to decrypt the email message. From step  1220 , flow diagram  1200  can continue with step  1222 . 
   In step  1222 , in an exemplary embodiment, the reader/responder module application can automatically save user  304  into an address book database along with a public key of user  304 . From step  1222 , flow diagram  1200  can continue with step  1224 . 
   In step  1224 , in an exemplary embodiment, user  102  can then respond to the message. In an exemplary embodiment, user  102  can alternatively create a new secure encrypted e-mail message that can be sent to user  304  or any other licensed user of the email software client application to which user  102  has already sent a key, and from which user  102  has already received a response. From step  1224 , flow diagram  1200  can continue immediately with step  1226 , where flow diagram  1200  can end. 
   While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.