A user u1 opens outlook and accesses mail host abc.com . That mail host can be a Linux system running some mail server daemon e.g. postfix. On that host, multiple users are created. User u1 from outlook logs in as a user at abc.com . User writes a mail and send it to u5@xyz.com . The mail first goes to mail server for domain abc.com. abc.com sends it to mail server for xyz.com The user u5 can access the host for domain xyz.com and read the mail. on Mail client e.g. outlook a MUA (Mail user agent) runs, with which user writes and sends mails. MTA (Mail Transfer Agent) i.e mail server transports the messages over internet. Why we have used Agents? Each type of operation is done through some agent(program). Mail server runs a POP or IMAP server to hold users' mails. POP is not real time . IMAP is real time, See gmail's IMAP/POP settings to get better idea. SMTP( Simple Mail Transfer Protocol ) is used to transfer mails. Notes and ...
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