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Exchange Recipient Filter (Anti-Spam) problem after Migrating to 2003 to 2007

Posted on 2009-04-14
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Last Modified: 2013-11-22
Hi,

Right now I have a mixed environment of 2003/2007.  Going back a few months, my Postmaster account was bombarded with SPAM (thousands), but then I implemented recipient filtering in 2003 with tarpitting rules. The spam went away completely and the only thing in Postmaster was legit msg failures (like 1 or 2 a day).

Fast forward now to 2007 being implemented... Ever since I allowed the new exchange server to start acceping incoming mail from Postini the Postmaster account has been filling up with about 100 SPAM messages a day. I have recipient filtering on with restrictions on incoming IP addresses via SMTP. Obviously there is something missing from my 2007 configuration that it's not working as well as it was in 2003. Any suggestions?
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Question by:njmatt
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7 Comments
 
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Expert Comment

by:Mestha
ID: 24139807
Is the recipient filtering agent enabled? If you telnet to the server and do a test that way, do you get a reject message if sending to a non-valid user?

Simon.
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Author Comment

by:njmatt
ID: 24141317
5.1.1 User unknown
... when I put an a BS user
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Author Comment

by:njmatt
ID: 24141534
I should mentioned that the SPAM is addressed TO the postmaster.
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Accepted Solution

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Mestha earned 250 total points
ID: 24142697
If the spam is addressed to postmaster then that is either NDR spam or back scatter. If they are backscatter messages then Postini has to accept those messages, but should be scanning them and dropping the messages if they are spam.
If the messages came through the Postini system then you need to ask Postini why they are not blocking them.

Simon.
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Author Comment

by:njmatt
ID: 24148060
I just enabled non-account blocking per the suggestion of someone on the Postini forums. I will keep you posted over the next few hours.
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Author Comment

by:njmatt
ID: 24148080
actually - that seems it will block all of my distributions lists being that those are not added as users. that's no good.
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LVL 65

Expert Comment

by:Mestha
ID: 24150515
I don't understand what you think it is blocking in relation to groups. The filter does a plain lookup on the email address. As long as the group is mail enabled with a valid email address then it should be allowed through.

Simon.
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