SMTP
Smtp for sending emails & either pop3 orimap for receiving emails. Html Unix-based systems send mail is the most widely used smtp servers for email. A commercial package send mail includes a pop3 server. Microsoft exchange includes an smtp server and can also be set upto include pop3 support.
Smtp usually is implemented to operate over internet port25. An alternate to smtp that is widely used in Europe is x400. Many mail servers now support extended simple mail transfer protocol(esmtp) which aloows multimedia files to be derived email.
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