Internet Mail, SMTP (Simple Mail Transfer Protocol), MIME

• Wikipedia entry
• Tutorial
• Comparison of X.400 and SMTP
• New York Times explanation of SMTP
• encdec, a small utility that converts to and from base64 and quoted-printable
• PGP 2.6.2 technical specification
• PGP 5.x for Unix
• PGP FAQ, link to library
• PGP resources
• mpack creates MIME body parts
• A tutorial on how local mail delivery (MTA to MUA) works on Unix systems.
• Post.Office MTA
• Electronic Messaging Assocation
• ITSG fax/email gateway
• TPC.int fax gateway (free)
• MTAs:
  • sendmail
  • exim
• Zimbra mail and calendaring server Return-Path is populated from MAIL FROM SMTP command;

  Received: from foobar.columbia.edu (razor.cs.columbia.edu [128.59.16.8])
      by opus.cs.columbia.edu (8.12.10/8.12.10) with ESMTP id j8HMK2Wj016592
      for hgs@cs.columbia.edu; Sat, 17 Sep 2005 18:21:02 -0400 (EDT)
  

  foobar.columbia.edu is the EHLO claim

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  Last updated by Henning Schulzrinne