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users are not getting bounce backs (NDR)

Posted on 2009-04-15
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Last Modified: 2012-05-06
Hi guys,

I am having problem in one of our domains which has just one DC and 5 computers. When a user sends an email to an incorrect email address, he is not getting any bounce back about that and he should. The server has GFI Mail Essentials installed and configured.
Any idea what could be the problem? If you need more info, please let me know.

Thanks,

Peter.
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Question by:teknite
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Expert Comment

by:tigermatt
ID: 24150058

NDR messages may be disabled at the server. You don't mention which version of Exchange you are running, but assuming it's Exchange 2003, open Exchange System Manager and re-enable NDRs: Global Settings, Internet Message Formats, 'Default', Properties, Advanced, Check "Allow Non-Delivery Reports".

-Matt
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Author Comment

by:teknite
ID: 24150301
HI,

The verfsion of Exchange is 2003 SP2. The tick box is ticked for all options in the advanced section.
Thanks
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LVL 58

Expert Comment

by:tigermatt
ID: 24150621

When was the message sent? By default, Exchange will queue email and attempt to re-transmit it for up to 48 hours before "bouncing" it and returning it back to the sender.

-Matt
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Accepted Solution

by:
teknite earned 0 total points
ID: 24159423
Hi guys,

I resolved the issue. The problem was that GFI was using Directory Harvesting protection and it was filtering the email address of the pop server which was sending the bounce backs (Pop2Exchange). It started to work the moment I put the address on the white list.

Thanks for comments.

Peter.
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