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| | RFC 2821 (rfc2821) - Simple Mail Transfer Protocol |
 | | The translation algorithm used to convert mail from the Internet protocols to another environment's protocol SHOULD ensure that error messages from the foreign mail environment are delivered to the return path from the SMTP envelope, not to the sender listed in the "From:" field (or other fields) of the RFC 822 message. | | | Other mail systems gatewayed to the Internet often use a subset of RFC 822 headers or provide similar functionality with a different syntax, but some of these mail systems do not have an equivalent to the SMTP envelope. | | | SMTP systems are expected to make every reasonable effort to accept mail directed to Postmaster from any other system on the Internet. |
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http://www.faqs.org/rfcs/rfc2821.html
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| | SMTP Protocol Overview |
| | The protocol is designed to be equally useful to either a computer or a human, though not too forgiving of the human. | | | Simple Mail Transfer Protocol (SMTP), documented in RFC 821, is Internet's standard host-to-host mail transport protocol and traditionally operates over TCP, port 25. | | | A better-connected host can be designated as a DNS mail exchanger, then arrange for a relay scheme. |
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http://www.freesoft.org/CIE/Topics/94.htm
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| | [No title] |
| | These pages are designed as a reference for the Simple Mail Transfer Protocol (SMTP). | | | They cover today's SMTP implementations and the IETF SMTP specifications, including some SMTP extensions. |
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http://cr.yp.to/smtp.html
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