Mail server

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A mail server (alternatively known as message transfer agent, mail transfer agent or MTA; particularly known as mail relay, mail exchanger or MX, and MX host; hereinafter, the Server) is any software instance that transfers electronic mail messages from one computer to another using the Simple Mail Transfer Protocol (SMTP).

Usually, the Servers use other protocols such as POP3 and IMAP to communicate with mail user agents (or MUAs), which end-users usually utilize. Common senders submit their electronic mail messages to their MUA, which transfers the message to the sender's Server, which transfers the message to either the receiver's Server or mail relay between the two. Finally, the receiver's Server transfers the message to receiver's MUA.

The Server can also refer to mail server software or, more broadly, to email software used to setup the Server.

Best practices

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