It actually is a special program running on an Internet server machine that processes requests to subscribe and unsubscribe to mailing lists for various groups of e-mail users. It also handles the distribution of e-mail to everyone on the mailing list. Some list servers do not charge you for maintaining mailing lists for you while others do charge. This practice of sending mail bombs may be subject to criminal penalties due to the interruption of service that it can cause to all the e-mail users on the machine that receives the mail bomb. M ulti-Purpose I nternet M ail E xtensions.
P retty G ood P rivacy.
Post Office Protocol 3. This is an e-mail protocol like IMAP or SMTP, but not as in depth. Your POP3 server is your Internet Service provider if they are using POP3. Servers using POP3 will download all of your new e-mail messages to your PC each time you go to retrieve new messages from your Internet provider's system. This is the most commonly used program on the Internet for sending e-mail via the SMTP protocol.