Simple Mail Transfer Protocol
This RFC 5321 was published in 2008
This document is a specification of the basic protocol for Internet electronic mail transport.
It consolidates, updates, and clarifies several previous documents, making all or parts of most of them obsolete.
It covers the SMTP extension mechanisms and best practices for the contemporary Internet, but does not provide details about particular extensions.
Although SMTP was designed as a mail transport and delivery protocol, this specification also contains information that is important to its use as a "mail submission" protocol for "split-UA" (User Agent) mail reading systems and mobile environments.
RFC 5321 introduction
Transport of Electronic Mail
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Related Request for Comments
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