ChrisI guess I don't know nearly enough about the mail server commands. So the Mail From:, does it VERIFY the validity of the sender address?Can you or someone else maybe give me the actual step-by-step rundown of an SMTP connection, or at least point me to a reference for the steps a mail server takes to perform this? Thanks, Chris
Have a look at:
http://www.theshulers.com/whitepapers/internet_whitepaper.html#smtp
it gives a concise description of the SMTP conversation.
Note that the human readable FROM header in email is part of the DATA, and SIMS does not look at the DATA, it only looks at the "envelope". The envelope is the stuff that appears before the DATA, namely:
HELO
MAIL FROM
RCPT TO
MAIL FROM is the "return path"
RCPT TO is the person the mail is sent to
In the case of SIMS, all of the return path tests are performed on the MAIL FROM item. In fact, all of the tests except one ONLY look at the return path domain (the part after the @). The error routing test examines the entire MAIL FROM item to see if you have routed that domain or any addresses in that domain to ERROR.
SIMS never attempts to validate the local part (before the @) of the MAIL FROM item.
--
Neil
Neil Herber
Corporate info at http://www.eton.ca/
Eton Systems, 15 Pinepoint Drive, Nepean, ON, Canada K2H 6B1
Tel: (613) 829-4668
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