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Yahoo!'s SMTP page
Yahoo!'s directory of Simple Mail Transfer Protocol (SMTP).

RFC 1123
One of the most important RFCs, covering requirements for Internet client software, including Telnet, FTP, SMTP, and DNS.

SMTP RFC
Request for Comments document on Simple Mail Transfer Protocol (SMTP).

SMTP service extension for delivery status notifications RFC
Request for Comments document on SMTP service extension for delivery status notifications.

SMTP service extensions RFC
Request for Comments document on SMTP service extensions.