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RFC 2821 Simple Mail Transfer Protocol (SMTP)
http://www.ietf.org/rfc/rfc2821.txt
This document is a self-contained specification of the basic protocol for the Internet electronic mail transport. It consolidates, updates and clarifies, but doesn't add new or change existing functionality of the following:

  • the original SMTP (Simple Mail Transfer Protocol) specification of RFC 821 [30]
  • domain name system requirements and implications for mail transport from RFC 1035 [22] and RFC 974 [27]
  • the clarifications and applicability statements in RFC 1123 [2]
  • material drawn from the SMTP Extension mechanisms [19]