Abstract:
A server apparatus and a method for electronic mail transmission control are provided that enables electronic mail communication, even if a user does not know information regarding destination, such as a mail account, in advance. The server apparatus includes a receiver that receives an electronic mail data including a destination telephone number from a sender terminal. A memory section stores at least one telephone number and at least one IP address in association with each other. A transmitter obtains an IP address that is pre-associated with the destination telephone number from the memory section and transmits the electronic mail data to the obtained IP address.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    This invention relates to a server apparatus and a method for electronic mail transmission control.  
           [0003]    2. Description of Related Art  
           [0004]    Conventionally, electronic mail communications are ordinarily carried out such that electronic mail communications are carried out directly between terminals in accordance with the SMTP (Simple Mail Transfer Protocol) protocol and an electronic mail transmitted to a mail server is received by a destination terminal in accordance with the POP3 (Post Office Protocol version 3) protocol.  
           [0005]    However, in cases in which an electronic mail communication is carried out in accordance with the above described protocols, there is a problem that certain information regarding the destination of an electronic mail, such as a mail account, etc. must be known to the sender in advance. More specifically, when the SMTP protocol is followed, an IP address and a mail account must be known; and when the POP 3 is used, a mail account must be known.  
           [0006]    Accordingly, the present invention is provided in view of the foregoing problems, and an object of the present invention is to provide a server apparatus and a method for control of electronic mail transmission using the server apparatus, which enables an electronic mail communication without knowing in advance, information about the destination, such as an electronic mail account, etc.  
         SUMMARY OF THE INVENTION  
         [0007]    To achieve the above and/or other goals, the present invention provides a server apparatus that receives electronic mail data including a destination telephone number, from a sender electronic mail transmission terminal, that obtains an IP address that is pre-associated with the destination telephone number from a memory section that stores at least one telephone number and at least one IP address in association with each other, and that transmits the electronic mail data to the obtained IP address.  
           [0008]    In this way, since the IP address that is pre-associated with the telephone number designated by the sender electronic mail transmission terminal is obtained at the server apparatus, an electronic communication can be carried out without knowing the information about destination, such as an electronic mail account, etc., in advance.  
           [0009]    According to one aspect of the present invention, a server apparatus is provided that includes a receiver that receives electronic mail data, and an analyzer that extracts a destination telephone number from the electronic mail data. Further, in the server apparatus, a memory section stores at least one telephone number and at least one IP address in association with each other. A transmitter transmits the electronic mail data to an IP address that is pre-associated with the extracted destination telephone number in accordance with data stored in the memory section.  
           [0010]    According to this configuration, an electronic mail data is transmitted to an IP address that is pre-associated with the destination telephone number contained in the received electronic mail data. Therefore, without knowing the destination&#39;s information, such as a mail account, etc., in advance, if a telephone number of the destination is known, an electronic mail communication can be carried out.  
           [0011]    According to another aspect of the invention, in the server apparatus as described above, when the destination telephone number is not stored in the memory section, a sender of the electronic mail data is informed of an error.  
           [0012]    By virtue of this configuration, when a destination telephone number contained in the received electronic mail data is not stored in the memory section, the sender apparatus is informed of the error so as to enable an operator to be aware of the transmission error immediately and solicit the operator for the next procedure to be taken.  
           [0013]    According to a further aspect of the present invention, in the above-described server apparatus, upon transmission of the electronic mail data, the transmitter inserts, into the electronic mail data, an ID that is capable of identifying the electronic mail data, as a user name of a sender mail address, and a domain name indicating delivery confirmation as a domain name of the sender mail address.  
           [0014]    By this configuration, in the electronic mail data, an ID, by which the electronic mail data can be identified, is provided a user name of a sender mail address. Therefore, in this server apparatus, the electronic mail data can be controlled by this ID. Further, a domain name indicating delivery confirmation is provided as a domain name. Therefore, it is readily recognizable, at the destination, that the electronic mail data came from this server apparatus. Further, when this server apparatus receives an electronic mail returned from the destination, the server apparatus can immediately recognizes that the electronic mail is a delivery confirmation message. Accordingly, in a speedy manner, it is possible to inform an operator of the sender apparatus of the delivery confirmation.  
           [0015]    According to a still further aspect of the present invention, in the above-described server apparatus, an analyzer determines whether a domain name indicating delivery confirmation. When the domain name of the destination mail address is determined to be the domain name indicating delivery confirmation, the analyzer further determines whether transmission of previous electronic mail data has been completed, in accordance with a content of the electronic mail data.  
           [0016]    By this configuration, it can be immediately recognized that the received electronic mail data is a delivery confirmation message, when the domain name of the destination mail address of the received electronic mail data is a domain address indicating delivery confirmation. And, only in these cases, the determination as to completion of the electronic mail data process is made, depending on the contents of the electronic mail. Therefore, the process for delivery confirmation in this server apparatus can be simplified.  
           [0017]    According to a yet further aspect of the present invention, in the server apparatus, the analyzer determines whether a domain name of a destination mail address included in the electronic mail data is a domain name of a destination mail address included in the electronic mail data is a domain name indicating delivery confirmation, the analyzer further determines whether transmission of previous electronic mail data has not been completed normally.  
           [0018]    By this configuration, it can be recognized that the previously transmitted electronic mail has not been normally transmitted by merely receiving such an electronic mail data, in which a domain name of destination address is a domain name indicating delivery confirmation.  
           [0019]    According to a still another aspect of the present invention, in the server apparatus, when the domain name of the destination mail address is determined to be the domain name indicating delivery confirmation, the analyzer further determines whether transmission of previous electronic mail data has been completed, in accordance with a content of the electronic mail data.  
           [0020]    By this configuration, it can be immediately recognized that the received electronic mail data is a delivery confirmation message, when the domain name of the destination mail address of the received electronic mail data is a domain address indicating delivery confirmation. And, only in these cases, the determination as to completion of the electronic mail data process is made, depending on the contents of the electronic mail. Therefore, the process for delivery confirmation in this server apparatus can be simplified.  
           [0021]    According to a yet further aspect of the present invention, in the server apparatus, the analyzer determines whether a domain name of a destination mail address included in the electronic mail data is a domain name indicating delivery confirmation. When the domain name of the destination mail address is determined as the domain name indicating delivery confirmation, the analyzer further determines whether transmission of previous electronic mail data has not been completed normally.  
           [0022]    By this configuration, it can be recognized that the previously transmitted electronic mail has not been normally transmitted by merely receiving such an electronic mail data, in which a domain name of destination address is a domain name indicating delivery confirmation.  
           [0023]    According to a still another aspect of the present invention, in the server apparatus, when the domain name of the destination mail address is determined to be the domain name indicating delivery confirmation, the transmitter informs a sender of the previous electronic mail data of the result of the determination as to whether the transmission of the previous electronic mail data has been completed, in accordance with an ID, which is included, as a user name of the destination mail address, in the electronic mail data.  
           [0024]    By virtue of this configuration, in the received electronic mail data, if the domain name of the destination mail address is a domain name indicating delivery confirmation, in accordance with the identification ID given as the user name of the destination mail address is informed of the result (condition) of the transmission the sender of the previous electronic mail data, which has that identification ID. In other words, since senders are identified in accordance with identification IDs, the result of the process will be informed without error.  
           [0025]    According to a further aspect of the present invention, in the server apparatus, upon informing the result of the transmission to the sender of the previous electronic mail data, the transmitter transmits informing electronic mail data including a domain name indicating discarding as a domain name of a sender mail address of the informing electronic mail data. By this configuration, when the sender of the previous electronic mail data is informed of a result of the transmission process a domain name indicating discarding is given as the domain name of the sender mail address. Therefore, at the sender side, upon receipt of such notification of the result of transmission process, it is recognizable that the electronic mail data should be immediately discarded. Accordingly, a loop of electronic mail communications, which can be generated by receiving this electronic mail data and by further returning the same can be prevented.  
           [0026]    According to another aspect of the present invention, in the server apparatus, the memory section further stores a terminal type in association with each telephone number. When the destination telephone number is pre-associated with a terminal type indicating a terminal in compliance with H.323 as defined in an ITU-T Recommendation, the transmitter obtains an IP address of the terminal from an H.323 gatekeeper.  
           [0027]    By this configuration, when the IP address corresponding to the destination telephone number contained in the received electronic mail is not stored in the memory section, the IP address of the destination is obtained from an H.323 gatekeeper, and the electronic mail data is transmitted to the obtained IP address. Therefore, without knowing in advance the destination&#39;s information such as a mail account etc., only knowing the destination telephone number, electronic mail communications can be carried out.  
           [0028]    An electronic mail transmission terminal connected to the above-described server apparatus is also provided. The electronic mail transmission terminal includes an input unit through which the destination telephone number and a transmission instruction are input, and a transmitter that transmits, when the destination telephone number and the transmission instruction are input, an electronic mail data including the destination telephone number to the server apparatus.  
           [0029]    A communication system is further provided that includes the above-described electronic mail transmission terminal and the above-described server apparatus. When an electronic mail data is transmitted from the electronic mail transmission terminal t the server apparatus, the electronic mail data is transmitted to an IP address that is pre-associated with the destination telephone number contained in the electronic mail data.  
           [0030]    A method for controlling electronic mail transmissions is further provided. Electronic mail data including a destination telephone number is received from a sender electronic transmission terminal. Then, the destination telephone number is extracted from the electronic mail data. An IP address that is pre-associated with the destination telephone number is obtained from a memory section. The memory section stores at least one telephone number and at least one IP address in association with each other. Finally, the electronic mail data is transmitted to the obtained IP address.  
           [0031]    A server apparatus includes a receiver that receives electronic mail data, an analyzer that extracts a destination telephone number from the electronic mail data, a memory section that stores data including at least one telephone number and at least one IP address in association with each other, and a transmitter that transmits the electronic mail data to an IP address that is pre-associated with the extracted destination telephone number in accordance with data stored in the memory section.  
           [0032]    Further, when the destination telephone number is not stored in the memory, the transmitter informs a sender of the electronic mail data of an error. In addition, upon transmission of the electronic mail data, the transmitter inserts, into the electronic mail data, an ID that is capable of identifying the electronic mail data, as a user name of a sender mail address, and a domain name, indicating delivery confirmation, as a domain name of the sender mail address.  
           [0033]    Further, the analyzer determines whether a domain name of a destination mail address included in the electronic mail data is a domain name indicating delivery confirmation, and, when the domain name of the destination mail address is determined as the domain name indicating delivery confirmation, the analyzer further determines whether transmission of previous electronic mail data has been completed, in accordance with a content of the electronic mail data. Yet further, the analyzer determines whether a domain name of a destination mail address included in the electronic mail data is a domain name indicating delivery confirmation, and, when the domain name of the destination mail address is determined as the domain name indicating delivery confirmation, the analyzer determines that transmission of previous electronic mail data has not been completed normally.  
           [0034]    In addition, when the domain name of the destination mail address is determined as the domain name indicating delivery confirmation, the transmitter informs a sender of the previous electronic mail data whether the transmission of the previous electronic mail data has been completed, in accordance with an ID, which is included, in the electronic mail data, as a user name of the destination mail address. Further, upon informing the result to the sender of the previous electronic mail data, the transmitter transmits an informing electronic mail data, with a domain name of a sender mail address of the informing electronic mail data indicating discarding.  
           [0035]    The memory section further stores a terminal type in association with each telephone number, and, when the destination telephone number is pre-associated with a terminal type indicating a terminal in compliance with H.323 as defined in an ITU-T Recommendation, the transmitter obtains an IP address of the terminal from an H.323 gatekeeper.  
           [0036]    Further, the electronic mail transmission terminal includes an input unit through which the destination telephone number and a transmission instruction are input, and a transmitter that transmits, when the destination telephone number and the transmission instruction are input, an electronic mail data including the destination telephone number to the server apparatus.  
           [0037]    A communication system includes an electronic mail transmission terminal, and a server apparatus, the electronic mail transmission terminal including an input unit through which a destination telephone number and a transmission instruction are input, and a transmitter that transmits, when the destination telephone number and the transmission instruction are input, an electronic mail data including the destination telephone number to the server apparatus. The server apparatus comprises a receiver that receives the electronic mail data, an analyzer that extracts the destination telephone number from the electronic mail data, a memory section that stores data including at least one telephone number and at least one IP address in association with each other. A transmitter transmits the electronic mail data to an IP address that is pre-associated with the extracted destination telephone number in accordance with data stored in the memory section.  
           [0038]    A method for controlling electronic mail transmission includes receiving electronic mail data including a destination telephone number from a sender electronic mail transmission terminal, extracting the destination telephone number from the electronic mail data, obtaining an IP address that is pre-associated with the destination telephone number from a memory section that stores at least one telephone number and at least one IP address in association with each other, and transmitting the electronic mail data to the obtained IP address. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0039]    The present invention is further described in the detailed description which follows, with reference to the noted plurality of drawings by way of non-limiting examples of exemplary embodiments of the present invention, in which like reference numerals represent similar parts throughout the several views of the drawings, wherein:  
         [0040]    [0040]FIG. 1 is a schematic diagram showing a network in which a server apparatus of an embodiment according to the present invention operates;  
         [0041]    [0041]FIG. 2 is a block diagram showing the functions of the server apparatus of the embodiment according to the present invention;  
         [0042]    [0042]FIG. 3 illustrates an example of data registered in a terminal administration table in the server apparatus of the embodiment according to the present invention;  
         [0043]    [0043]FIG. 4 illustrates an example of data registered in a telephone number/IP address administration table in the H.323 gatekeeper that is in communication with the server apparatus of the embodiment according to the present invention;  
         [0044]    [0044]FIG. 5 illustrates an example of data registered in the message administration DB in the server apparatus of the embodiment according to the present invention;  
         [0045]    [0045]FIG. 6 is a flowchart showing the electronic mail transmission operation of the server apparatus of the embodiment according to the present invention;  
         [0046]    [0046]FIG. 7 is a flowchart showing the operation of the normal message process of the server apparatus of the embodiment according to the present invention;  
         [0047]    [0047]FIG. 8 is a flowchart showing a procedure for registering a default domain name in the IFAX of the embodiment; and 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0048]    An embodiment of the present invention will be explained with reference to the accompanying drawings below.  
         [0049]    [0049]FIG. 1 is a schematic diagram showing a network in which a server apparatus of an embodiment of the present invention operates.  
         [0050]    As shown in FIG. 1, a server apparatus  101  of this embodiment is connected to an apparatus that manages and executes sending and receiving of electronic mail in accordance with IP addresses (hereinafter called as “IP apparatus”). An IP apparatus can be any terminal that is capable of an electronic communication function, such as a personal computer, a PDA, etc. However, in this embodiment, a non-limiting example will be explained in which Internet facsimile apparatuses (hereinafter called as “IFAX(es)”)  102  and  103  are connected as IP apparatuses. These IFAXes  102  and  103  are constructed in the same way as the IFAXes disclosed in Japanese Laid-Open Patent Application No. Hei 8-242326 in U.S. Pat. No. 5,881,233 are constructed.  
         [0051]    The IFAXes  102  and  103  are connected to the server apparatus  101  through the Internet  105  by a dial-up connection to a predetermined provider through the Public Switched Telephone Network (“PSTN”)  104 .  
         [0052]    Here, when an electronic mail transmission process is executed, the IP apparatus (IFAXes  102  and  103  in this embodiment), which is connected to this server apparatus  101  always accesses this server apparatus  101  and transmits a message (subject) to be transmitted to the server apparatus  101 . Using this particular feature, this server apparatus  101  can send an electronic mail even in the situation where an operator of the sender IP apparatus does not know the information regarding the destination, such as a mail account, etc. More specifically, the destination will be identified by a telephone number input by the operator of the sender IP apparatus and an electronic mail will be transmitted to the identified destination.  
         [0053]    Explaining this more specifically with regard to the case in which the IFAX  102  is the sender and the IFAX  103  is the destination, when a telephone number of the IFAX  103  is input by an operator, the IFAX  102  transmits an electronic mail including the telephone number in header information, to the server apparatus  101  in accordance with the SMTP protocol. The server apparatus  101  recognizes the telephone number contained in the header information of the electronic mail as identifying the IP address of the IFAX  103 , which is the destination of the electronic mail; and thereafter, transmits the received electronic mail message to the IFAX  103  in accordance with the SMTP protocol.  
         [0054]    Incidentally, each IP apparatus, which is connected to the server apparatus  101 , has, for electronic mail transmission, its own telephone number as a user name, which is a part of the sender electronic mail address. That is, if the telephone number is 012-3456-7890, “01234567890@domain name” will be registered as its own electronic mail address.  
         [0055]    [0055]FIG. 2 is a block diagram showing the functions of the server apparatus  101  of this embodiment.  
         [0056]    In FIG. 2, a SMTP receiving unit  201  receives an electronic mail transmitted from the sender IP apparatus in accordance with the SMTP protocol. In this embodiment, as explained above, an electronic mail whose header information contains a telephone number will be received.  
         [0057]    A message analysis unit  202  analyzes the electronic mail transmitted from the sender IP apparatus and divides it into a header information portion and a message portion. Further, the message analysis unit  202  divides a sender electronic mail address contained in the header information into a sender telephone number and a domain; yet further, it divides the destination electronic mail address into the destination account (telephone number) and a domain.  
         [0058]    A user authentication unit  203  determines whether a user registration has been made by checking the sender telephone number and the destination telephone number. More specifically, it is determined whether user registrations were made, with reference to these telephone numbers are registered in a terminal administration table  204 .  
         [0059]    Here, with reference to FIG. 3, an example of how registrations are made in the terminal administration table  204  will be explained. FIG. 3 shows an example of data registered in the terminal administration table  204 . The terminal administration table  204  can be stored in any memory unit provided in or attached to the server apparatus  101 , such as a main memory (RAM), hard disks or other secondary memory.  
         [0060]    As shown in FIG. 3, in the terminal administration table  204 , in association with the telephone numbers  301 , IP addresses  302 , domains  303 , reception functions  304  and terminal types  305  are registered. FIG. 3 shows an example in which, as terminal types, a terminal that is in compliance of the ITU-T Recommendation H.323 (hereinafter called as “H.323 Terminal”) and IFAXes are registered. An IP address of the H.323 Terminal is administered by an H.323 gatekeeper (to be explained later); therefore, no fixed IP address is registered here.  
         [0061]    An IP conversion unit  205  converts the destination telephone number designated by the sender IP apparatus to the destination IP address based on the data registered in the terminal administration table  204 . as explained above, in the case in which the terminal type corresponding to the destination telephone number is an H.323 Terminal, since no fixed IP address is registered in the terminal administration table  204 , the IP conversion unit  205  transmits an inquiry to the H.323 gatekeeper  206  and obtains an IP address that corresponds to the destination telephone number that is designated by the sender IP apparatus.  
         [0062]    Incidentally, as shown in FIG. 4, the H.323 gatekeeper  206  is provided with a telephone number/IP address administration table in which IP addresses are registered in association with telephone numbers. The H.323 gatekeeper  206  responds with the IP addresses that correspond to the respective telephone numbers in response to the inquiries from the IP conversion unit  205 .  
         [0063]    A transmission message creation unit  207  creates a transmitting message for an electronic mail message received from a sender IP apparatus, which includes a message administration ID, which is capable of identifying the electronic mail. Further, predetermined information indicating the transmitting message, is registered in a message administration database (DB)  208 .  
         [0064]    Now, with reference to FIG. 5, an example of data registered in the message administration DB  208  is explained. FIG. 5 shows an example of the data that is registered in the message administration DB  208 .  
         [0065]    As shown in FIG. 5, in the message administration DB  208 , in association with the message administration IDs  501 , which are assigned to the transmitting messages, telephone numbers of senders  502 , telephone numbers of destinations and attachment file names  504  are registered.  
         [0066]    A SMTP transmission unit  209  transmits the transmitting messages in accordance with the SMTP protocol and in accordance with the data obtained from the massage administration DB  208 , to the IP address of the destination IP apparatus, converted by the IP conversion unit  205 .  
         [0067]    Next, an electronic mail transmission operation of the server apparatus  101 , which is constructed as explained above, will be explained with reference to FIG. 6. FIG. 6 is a flowchart showing the electronic mail transmission operation of the server apparatus  101 . In the following discussion, an explanation will be given for a case in which the IFAX  102  is a sender IP apparatus and the IFAX  103  is a destination IP apparatus. Further, to the IFAX  102  and IFAX  103 , as shown in FIG. 3, the telephone numbers “2345-67-8901” and “9999-99-9999” are assigned, respectively.  
         [0068]    In order to transmit electronic mail to the server apparatus  101 , the IFAX  102  reads a document to be transmitted through a reading screen; and thereafter, by inputting the telephone number of the destination IFAX  103 , a transmission instruction is given.  
         [0069]    In the server apparatus  101 , the SMTP receiving unit  201  receives a MAIL command that is transmitted from the IFAX  102  in response to the instruction to transmit (ST 601 ). The MAIL command includes an electronic mail address that is determined in such a way that the telephone number of the IFAX  102  (i.e., the sender) is included as a user name. More specifically, in the header information of the electronic mail, the electronic mail address “2345-67-8901@ccc” is inserted into the portion indicating the sender (i.e., “MAIL FROM:”).  
         [0070]    The message analysis unit  202  analyzes this electronic mail address of the sender and divides it into the sender telephone number and domain (ST 602 ). In other words, from the sender electronic mail address, the telephone number “2345-67-8901” and the domain “CCC” are obtained. The sender telephone number so obtained is forwarded to the user authentication unit  203 .  
         [0071]    The user authentication unit  203  determines whether the IFAX  102  has been registered as a user, by checking whether the telephone number of this sender has been registered in the terminal administration table  204  (ST 603 ). In the instant case, as FIG. 3 shows, since the telephone number of the IFAX  102  is registered in the terminal administration table  204 , it is determined that the IFAX  102  has been registered as a user.  
         [0072]    Upon determining that the IFAX  102  has been registered as a user, the SMTP receiving unit  201  receives a RCPT command transmitted from the IFAX  102  (ST 604 ). The RCPT command includes the telephone number of the destination IFAX  103 . More specifically, in the header information of the electronic mail, the telephone number “9999-99-9999” is inserted to the portion indicating the destination (i.e., “RCPT TO:”).  
         [0073]    Incidentally, in ST 603 , if the sender telephone number is not registered in the terminal administration table  204 , an error code (for example, “501”) will be transmitted to the sender IFAX  102  in accordance with the SMTP protocol and the transmission operation of the electronic mail will be finished (ST 605 ).  
         [0074]    In ST 604 , if the message analysis unit  202  receives a RCPT command, it analyzes the electronic mail address of the destination and divides the same into the destination telephone number and the domain (ST 606 ). Namely, from the destination mail address, the telephone number, “9999-99-9999” (as well as the domain, in predetermined cases) is obtained. In the instant case, since only the telephone number is inserted as the electronic mail address of the destination, it will be determined that there is no domain. Incidentally, the predetermined cases in which domain will be obtained are such cases, as explained later, in which a delivery confirmation massage is processed or message discarding is processed.  
         [0075]    After dividing the electronic mail address of the destination in ST 606 , the message analysis unit  202  analyzes the domain that is obtained from such dividing (ST 607 ). More specifically, the message analysis unit  202  determines whether the obtained domain is a domain for delivery confirmation, a domain for discarding, or other domains (ST 609 ). The domain for the delivery confirmation and the domain for discarding will be explained later. In the present case, as explained above, it is determined that there is no domain; therefore, it is treated as other domains (i.e., neither discarding or delivery confirmation).  
         [0076]    The processes to be performed will be selected in accordance with the domain determination made in ST 608 . Namely, if the domain is determined as other domain, a normal message process will be selected (ST 609 ). If the domain is determined as a domain for delivery confirmation, a message process for the delivery confirmation will be selected (ST 610 ). Further, if the domain is determined as a domain for discarding, a process for discarding a message will be selected (ST 611 ). In the present case, since it is determined as other domains, the normal message process will be selected.  
         [0077]    The normal message process will be explained with reference to FIG. 7 since FIG. 7 is a flowchart showing an operation of the normal message process.  
         [0078]    If the normal message process is selected in ST 608 , the user authentication unit  203  will determine whether the IFAX  103  has been registered as a user, by checking whether the destination telephone number obtained in ST 606  has been registered in the terminal administration table  204  (ST 701 ). In the present case, as shown in FIG. 3, the telephone number of the IFAX  103  is registered in the terminal administration table  204 ; therefore, it will be determined that the IFAX  103  has been registered as a user.  
         [0079]    If it is determined that the IFAX  103  has been registered as a user, the message analysis unit  202  will analyze the electronic mail message received through the SMTP receiving unit  201  and divide the electronic mail message (ST 702 ). More specifically, since the sender is the IFAX  102 , the received electronic mail message will be divided into the header information and a TIFF (Tagged Image File Format) file.  
         [0080]    Incidentally, in case that the telephone number of the destination has not been registered in the terminal administration table  204 , an error code (for example,  550  or  551 ) will be transmitted to the sender, i.e., the IFAX  102 , in accordance with the SMTP protocol and the transmission operation of electronic mail will be finished (ST 703 ).  
         [0081]    After dividing the received electronic mail message into the header information and the TIFF file in ST 702 , the message analysis unit  202  will determine whether the attachment file to the received electronic mail message is of TIFF image (ST 704 ). In other words, it is determined whether the attached file is compressed, for example, in accordance with the MH compression format. More specifically, by checking the header information of the TIFF file, which is attached to the multi-part mail in accordance with the MIME (Multipurpose Internet Mail Extension), it is determined whether the attached file to the electronic mail message is the TIFF image.  
         [0082]    The IP conversion unit  205  receives the destination telephone number obtained by the message analysis unit  202 . And, using this telephone number, the IP conversion unit searches the terminal administration table  204  and obtains the terminal type and the domain of the destination (ST 705 ). In this instant case, as the terminal type, “IFAX” will be obtained, and as the domain, “BBB” will be obtained. The terminal type and domain so obtained are forwarded to the SMTP transmission unit  209 .  
         [0083]    On the other hand, the transmission message creation unit  207  assigns a message administration ID to the electronic mail message received from the IFAX  102  taking into account the determination results in ST 704 . At this time, the transmission message creation unit  207  registers an administrative record, indicating the contents of this transmitting message, unit  207  registers an administrative record, indicating the contents of this transmitting message, in the message administration DB 208  (ST 706 ). This administrative record includes, as shown in FIG. 5, the message administration ID  501 , the sender telephone number  502 , the destination telephone number  503 , the name of the attachment file  504 , etc. In the present case, more specifically, as shown at the upper most column in FIG. 5, the administrative record whose message administration ID is “100” is recorded.  
         [0084]    Further, the transmission message creation unit  207  creates a transmitting message, in which a sender electronic mail includes the above described message administration ID ( 100 ) as a user name and a domain for delivery confirmation as a domain (ST 707 ). Here, a domain for delivery confirmation can be any domain, however, for example, it is assumed that “svr.confirm” is used. Therefore, in the present case, such a transmitting message including “100@svr.confirm” as a sender electronic mail address, will be created. The transmitting message so created is forwarded to the SMTP transmission unit  209 .  
         [0085]    When the transmitting message is created, the IP conversion unit  205  obtains an IP address of the destination in accordance with the destination terminal type obtained in ST 705  (ST 708 ). More specifically, if the terminal type of the destination is an IFAX, an IP address will be obtained from the terminal administration table  204 , and if the terminal type of the destination is an H.323 terminal, an IP address will be obtained by communicating with an H.323 gatekeeper  206  (H.323 LPQ/LCF). In the instant case, since the destination terminal type is the IFAX  103 , the IP conversion unit  205  obtains the IP address ( 133 . 185 . 250 . 12 ) from the terminal administration table  204 . The IP address so obtained is forwarded to the SMTP transmitting unit  209 .  
         [0086]    Upon receiving this IP address, the SMTP transmission unit  209  transmits the transmitting message created in ST 707  to the designated (obtained) IP address, in accordance with the SMTP protocol (ST 709 ). At this time, the SMTP transmission unit  209  determines the destination electronic mail address by referring to the administrative record that corresponds to the message administration ID of the subject to be transmitted (i.e., “100” in this embodiment), registered in the message administration DB 208 . More specifically, the destination electronic mail address is determined in such a way that the telephone number of the destination is included as the user name. In this instant case, the destination electronic mail address, included in the transmitting message, will be determined as “9999-99-9999@BBB”.  
         [0087]    Upon transmission of the transmitting message, the SMTP transmission unit  209  determines whether the electronic mail transmission has been completed normally. Here, if the transmission of the electronic mail has been completed normally, the transmission operation of electronic mail will be finished. On the other hand, if the transmission of the electronic mail has not been completed normally due to some reason, including, for example that the electric power of the destination IFAX  103  has not been turned on, the transmitting message creation unit  207  will be notified of the incomplete transmission.  
         [0088]    Upon reception of this notification, the transmission message creation unit  207  creates an error mail message including: as a main text, a predetermined message indicating contents (details) of error; and as an attachment file, the transmitting message that could not be transmitted (ST 711 ). This error mail message will be forwarded to the SMTP transmission unit  209 .  
         [0089]    When the error mail message is created, the IP conversion unit  205  obtains the sender&#39;s IP address in the same way as in ST 708  depending on the terminal type of the sender (IFAX  102 ) that has been registered in the terminal administration table  204  (ST 712 ). In the instant case, since the terminal type of the sender is the IFAX  102 , the IP conversion unit  205  will obtain the IP address ( 133 . 185 . 250 . 13 ) from the terminal administration table  204 . The IP address so obtained will be forwarded to the SMTP transmission unit  209 .  
         [0090]    Upon receipt of this IP address, the SMTP transmission unit  209  transmits the error mail message created in ST 711  to the designated IP address in accordance with the SMTP protocol (ST 713 ) and completes the electronic mail transmission operation.  
         [0091]    Next, the delivery confirmation message process (ST 610 ) that will be executed when a domain for delivery confirmation is determined in ST 608  in FIG. 6 will be explained with reference to FIG. 8. FIG. 8 is a flowchart showing the operation of the delivery confirmation message process of the server apparatus  101 .  
         [0092]    Here the delivery confirmation message process will be explained. The delivery confirmation message process is a process that, when, for whatever reasons, a transmitting message from the server apparatus  101  is not delivered to the destination IP apparatus, the destination IP apparatus transmits a predetermined delivery confirmation message to the sender IP apparatus. In the following explanations, it is assumed that, since the transmitting message form the above described IFAX  102  does not arrive at the IFAX  103 , the IFAX  103  will execute the delivery confirmation message process.  
         [0093]    In this delivery confirmation message process, how determinations for the delivery confirmation in the server apparatus should be made can be freely determined. For example, it may be determined to transmit a delivery confirmation message from the destination IP apparatus only when a transmitting message from the server apparatus  101  does not arrive at the destination IP apparatus. In this case, when that delivery confirmation message is received, it can be determined that the transmitting message has not been delivered. It may also be determined to transmit a delivery confirmation message in every case in response to the transmitting of messages form the server apparatus  101 . In this case, depending on the contents of the delivery confirmation message, it can be determined whether the transmitting message has been delivered. In this instant case, the former way of determination is adopted.  
         [0094]    Incidentally, in the header information of this delivery confirmation message, the sender electronic mail address and the destination electronic mail address that are contained in the header information of the transmitting message from the above described IFAX  102  are switched (exchanged). Thus, in the above example, as a sender electronic mail address, “9999-99-9999@BBB”, which was originally the destination mail address, is designated; and as a destination electronic mail address, “100@svr.confirm”, which was originally the sender mail address, is designated.  
         [0095]    In the delivery confirmation message process, the processes from ST 601  through ST 608  described in FIG. 6 are to be executed in the same way. Note that, in ST 606 , a destination electronic mail address of the delivery confirmation message is analyzed and divided into the message administration ID ( 100 ) of a transmitting message that is not delivered to the IFAX  103  and a domain for delivery confirmation (svr.confirm). These message administration ID, etc. will be forwarded to the transmitting message creation unit  2207 . Further, in ST 608 , the delivery confirmation message process will be selected.  
         [0096]    If the delivery confirmation message process is selected, the result of the delivery confirmation will be determined in accordance with the setting of delivery confirmation determinations as described above (ST 801 ). In the present case, since a delivery confirmation message has been received from the IFAX  103 , it is determined that the transmitting message from the IFAX  102  has not arrived at the IFAX  103 .  
         [0097]    When the result of the delivery confirmation is determined in ST 801 , the SMTP transmission unit  209  obtains the telephone numbers of the original sender (IFAX  102 ) and the original destination (IFAX  103 ) from the message administration DB  208  in accordance with the message administration ID ( 100 ) that has been received via the message analysis unit  202  and the transmitting message creation unit  207  (ST 802 ).  
         [0098]    The IP conversion unit  205  obtains the telephone number of the original sender (IFAX  102 ) from the SMTP transmission unit  209 ; and using this telephone number, searches the terminal administration table  204 ; and obtains the terminal type and the domain of the original sender (IFAX  102 ) (ST 803 ). In this instant case, the terminal type of sender IFAX  102 , i.e., “IFAX”, and the domain “CCC” will be obtained. The terminal type and the domain of the original sender (IFAX  102 ) so obtained are forwarded to the SMTP transmission unit  209 .  
         [0099]    On the other hand, the transmitting message creation unit  207  creates an error mail message including: as a main text, the message indicating that the transmitting message has not been arrived; and as an attachment file, the transmitting message that could not be transmitted (ST 804 ). This error mail massage will be forwarded to the SMTP transmission unit  209 .  
         [0100]    Incidentally, the transmitting message creation unit  207  determines a sender electronic mail address included in the header information of the delivery confirmation message, in such a way that the telephone number (9999-99-9999) of the original destination (IFAX  103 ) forms the user name portion, and a domain for discarding forms the domain portion. The domain for discarding may be anything; but, for example, “svr.delete” may be used. In this instant case, the sender electronic mail address is determined as “9999-99-9999@svr.delete”.  
         [0101]    The IP conversion unit  205  obtains the IP address, in the same way as in ST 708  or ST 712 , in accordance with the terminal type of the original sender (IFAX  102 ) that is obtained ST 803  (ST 805 ). In the present case, the terminal type of original sender is the IFAX  102  so that the IP conversion unit  205  obtains the IP address ( 133 . 185 . 250 . 13 ) from the terminal administration table  204 . The IP address so obtained will be forwarded to the SMTP transmission unit  209 .  
         [0102]    Upon receiving this IP address, the SMTP transmission Unit  209  transmits the error mail message that has been created in ST 804  to the designated IP address (received from the IP conversion unit in ST 805 ) in accordance with the SMTP protocol (ST 806 ). And, after transmitting the error mail message, the transmission operation of electronic mail is finished.  
         [0103]    Next, the process to discard the message that will be executed when it is determined to be a domain for discarding in ST 608  in FIG. 6 will be explained. This process prevents an infinite loop of electronic mail communication that can occur in such a way that the original sender of IFAX  102  that has received a delivery confirmation message transmits an error mail message to the original destination of IFAX  103 .  
         [0104]    In this message discarding process, the processes described from ST 601  through ST 608  in FIG. 6 are executed in the same way. In this case, this process is selected when in ST 608 , a domain for discarding (svr.delete) is detected. And, in this case, the received electronic mail message is discarded (ST 611 ) and the electronic mail transmission operation is finished.  
         [0105]    As explained above, by using the server apparatus  101  of this embodiment, either IP addresses that are registered in the terminal administration table  204  in association with the telephone numbers of destinations, or IP addresses that are notified by an H.323 gatekeeper, etc., in response to an inquiry, in accordance with terminal types registered in the terminal administration table  204 , are obtained. Therefore, even if an operator of a sender apparatus does not know information of the destination, such as a mail account, etc., in advance, if he/she knows of the telephone number of the destination, an electronic mail can be transmitted.  
         [0106]    As explained in the foregoing, according to the present invention, and IP address that corresponds to the telephone number designated by a sender is obtained, so that even if the information of the destination, such as a mail account, etc., is not known in advance, electronic mail communications can be performed.  
         [0107]    It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in now way to be construed as limiting of the present invention. While the present invention has been described with reference to certain embodiments, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the present invention in its aspects.  
         [0108]    Although the present invention has been described herein with reference to particular means, materials and embodiments, the present invention is not intended to be limited to the particulars disclosed herein; rather, the present invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.  
         [0109]    The present disclosure relates to subject matter contained in priority Japanese Application No. 2000-366839, filed on Dec. 1, 2000, which is herein expressly incorporated by reference in its entirety.