Make sure you understand what that validation is. The question SIMS answers is: Does the domain part of the Return-Path exist in DNS and have either an A record or an MX record that resolves to an existing A record?http://www.theshulers.com/whitepapers/internet_whitepaper.html#smtpLooked at that.It had good information.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:I knew that SIMS wouldn't read any of the data from the message, but I guess my question related to what information in the envelope SIMS does verify and in that verification whether the information you get from that conversation is accurate.SIMS never attempts to validate the local part (before the @) of the MAIL FROM item.Don't need the local part validated at this point. The domain would suffice right now. So, if in fact, that is what SIMS already does, then I guess my question is answered.
That amounts to determining whether it is possible to try to mail the sender. It does not confirm that the sender 'local part' (i.e. specific mailbox) exists OR whether the domain part is consistent in any way with the path the mail is arriving from. Those are much more difficult checks, and can't really be done in a fully reliable and safe fashion.
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Bill Cole
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