>I recently started receiving a bunch of undeliverable messages from the
>postmaster. They are messages that originated from another server, were sent
>to an invalid user on our server but the return address is invalid, so our
>server says it is unable to return it because it is an invalid user.
>It seems that maybe these type of messages were returned to the originating
>server as undeliverable, why would I be receiving them now?
These are called "Double Bounces". They occur when the postmaster on the
remote server refuses E-mail sent from the NULL <> sender (which violates
the RFCs). Thanks to them, you have to spend time reading and dealing with
*their* bounce messages.
You can go to http://www.rfc-ignorant.org for a database of people known to
do this.
-Scott
Declude: Anti-virus, Anti-spam and Anti-hijacking solutions for
IMail. http://www.declude.com
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