Local Mail Transfer Protocol, October 1996
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SMTP [SMTP] [HOST-REQ] and its service extensions [ESMTP] provide a mechanism for transferring mail reliably and efficiently. The design of the SMTP protocol effectively requires the server to manage a mail delivery queue. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.