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Exchange 2013 Spam Filtering does not seem to be working

Posted on 2014-04-07
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Last Modified: 2014-04-09
We have just recently migrated from Exchange 2010 to Exchange 2013 and when we made the switch we immediately started receiving a ton of spam.  I have run the antispm install script and have verified that all of our settings (blacklists, whitelists, etc.) were transfered over. From what I can tell, everything is setup properly on the new server, but we are getting much more spam. How can I tell that everything anti-spam is working properly on the Exchange 2013 server?

If I run Get-TransportAgent I receive the following:
Identity                                           Enabled         Priority
--------                                           -------         --------
Transport Rule Agent                               True            1
Malware Agent                                      True            2
Text Messaging Routing Agent                       True            3
Text Messaging Delivery Agent                      True            4
Content Filter Agent                               True            5
Sender Id Agent                                    True            6
Sender Filter Agent                                True            7
Recipient Filter Agent                             True            8
Protocol Analysis Agent                            True            9
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Question by:DataDudes
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by:Simon Butler (Sembee)
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If you use perfmon you can see how many messages were scanned by each option - for the content filter agent it will also show you what the count of each SCL value is.

Start there first, see if the values are above zero or not (they are reset by restarting the transport service).

Simon.
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by:DataDudes
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It looks like Performance Monitor is showing that messages are being scanned. As far as I can tell everything is set as it should be but we are getting spam email after spam email.
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by:Brad Bouchard
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I'd check your SCL levels.  See here:

http://technet.microsoft.com/en-us/library/aa995744(v=exchg.150).aspx

You can adjust them a little at a time until you find the sweet spot.

http://planetlotus.org/profiles/john-willemse_118363
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by:DataDudes
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I just realized that Connection Filtering isn't installed on Exchange 2013. When I run Enable-TransportAgent "Connection Filtering Agent"
I get the response "Transport agent "Connection Filtering Agent" isn't found. This means my RBL's and reverse DNS aren't looking, correct? Is there a way to enable this?
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Brad Bouchard earned 500 total points
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by:DataDudes
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Thanks. I was able to get this installed, but there is a 3 or 4 minute delay on incoming emails. Although if it is working properly and we don't get any more spam, it is worth the delay. I'll post back tomorrow if this did not solve the problem. Thanks for your help!
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by:Brad Bouchard
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The delay will most likely go away.  Let me know how it goes.
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by:DataDudes
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The delay is still there, but spam has drastically decreased now. Thank you for your help on this
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