Stop the "Undelivered Mail Returned to Sender"

Aleksandar Milivojevic alex at
Wed Feb 8 14:21:11 EST 2006

Quoting Benjamin Adams <badams at>:

> I get a lot of mail spoofing is here anyway I can stop this?
> Or see if make is really coming from my mail server?

Hi Ben,

It's kind of off-topic for this mailing list, and the answer is MTA 
specific (you'd be probably much better off asking this on 
your-MTA-of-choice mailing list or newsgroup).  It also greatly depends 
on how your email servers are organized and what your users are allowed 
or not allowed to do (and if you can cover your ass, excuse my french, 
by telling "user was not allowed to do that").

In short, usually there's not much that you could do in general case.  
Unlike the spam/virus message that triggered creation of MDN, the MDN 
itself is perfectly valid looking email.  You might be able to use some 
tricks to detect some MDN messages that are not triggered by emails 
leaving your mail server, but not all of them (and you might end up 
blocking valid MDN messagess too).

This message was sent using IMP, the Internet Messaging Program.

More information about the Info-cyrus mailing list