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I am looking for any advice on how I can stop back scatter on my sendmail servers. I have looked at the privacy flags and setting a non delivery for anything. I don't think this is a good approach.

I have looked all over but have not be able to find any good documentation on controlling the back scatter issue.

I would appreciate and feed back on stopping this problem.


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Do you mean that backscatter is originating from your mail server, or that you are receiving backscatter from others? –  Michael Hampton May 4 '13 at 21:59
As Michael suggested any good and short answer requires info about specific kind of backscatter you want to stop. –  Andrzej A. Filip May 5 '13 at 4:56
Yes the backscatter is originating from my servers. I should have specified that from the start my apologies. –  bhamacher May 5 '13 at 14:07
What kind of backscatter do you get? Unknown local recipient / mailbox over quota / ..... –  Andrzej A. Filip May 5 '13 at 20:57
It appears the majority of the backscatter is being sent to unknown local recipients. We are then sending mail back to a legitimate end user because the from address has been spoofed. to=<un_pc@un.org>, delay=00:00:02, xdelay=00:00:02, mailer=esmtp, pri=32321, relay=unasav1.un.org. dsn=5.0.0, stat=User unknown r459tUFC028847: r459tUFD028847: return to sender: User unknown –  bhamacher May 6 '13 at 1:11

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