A new Request for Comments is now available in online RFC libraries.
RFC 5321
Title: Simple Mail Transfer Protocol
Author: J. Klensin
Status: Standards Track
Date: October 2008
Mailbox: john+smtp@jck.com
Pages: 95
Characters: 225929
Obsoletes: RFC2821
Updates: RFC1123
I-D Tag: draft-klensin-rfc2821bis-11.txt
URL: http://www.rfc-editor.org/rfc/rfc5321.txt
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. [STANDARDS TRACK]
This is now a Draft Standard Protocol.
STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and suggestions
for improvements. Please refer to the current edition of the Internet
Official Protocol Standards (STD 1) for the standardization state and
status of this protocol. Distribution of this memo is unlimited.
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