Does anyone know what the RFC says about messages from the postmaster account to another mail server's user.
What are you looking for specifically?
Are you referring to the postmaster account ("[EMAIL PROTECTED]"), or the NULL sender ("<>") that is used as the return address for bounce messages?
I found a setting that can send certain spam back to the originator as 'undeliverable to [EMAIL PROTECTED]'.
Please do NOT use such an option, unless you are *very* sure that you know exactly what you are doing and *why*. In most cases, this is a very bad thing to do (if you're not sure, think about what would happen if *everyone* did exactly what you are doing).
Usually, if we send a message to this return address it comes back saying, "This user does not exist or this system, blah blah blah".
That's bad. The postmaster@ account should exist. RFC2821 4.5.1 (and 2 other RFCs) make this clear. When you find 'em, submit 'em to http://www.rfc-ignorant.org .
However I am not seeing these messages returned to the postmaster on the machine which is sending the undeliverable message.
Are you using the bogus "Refuse NULL <> Senders" option in IMail (in the SMTP settings)? That would cause this problem -- that box should be UNchecked.
-Scott
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