SMTP

HowTo - Linux Mail Server - Postfix

If you want to send or receive an email you should have a mail server capable of sending and receiving mail across the Internet, in this post we will discuss Linux mail server and how SMTP protocol (the standard protocol for mail transport across the internet) works as well as other mail-related protocols, like Post Office Protocol (POP) and Internet Message Access Protocol (IMAP) and the relationship between them.  Linux SMTP Mail Server SMTP (Simple Mail Transfer Protocol) defines how a mail is sent from one host to another, it does not define how the mail should be stored or how it is displayed, and it is also system independent, which means the sender and receiver could have different operating systems.

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