Internet mail servers use Simple Mail Transfer Protocol

   (SMTP) to move e-mail from one server to another and then use either IMAP or Post Office Protocol (POP) to manage the e-mail and store messages in the appropriate mailboxes.
   IMAP allows users to download mail selectively, to look at a message header, to download only part of a message, to store messages on the server in a hierarchical structure, and to link to documents and Usenet newsgroups. IMAP also has strong authentication features and supports Kerberos. Search commands are also available so that users can locate messages based on their subject or header or based on content .

Dictionary of networking . 2014.

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