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Exchange 2003 Sending Spam and IP Blocked

Posted on 2014-01-15
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Last Modified: 2014-01-15
Hi,

I have a issue with a Exchange 2003 server, for the last 2 x days it keeps getting black listed by spamhaus as something is sending spam out, we have checked Anti Virus and all seems ok, any ideas where to start ?

Regards
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Question by:ComexIT
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by:Alan Hardisty
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My article is a good place to start and should hopefully help you nail the problem quickly so you can get off the blacklists and get your mail flowing again:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2556-Why-are-my-outbound-queues-filling-up-with-mail-I-didn't-send.html

Any questions, please ask.

Alan
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by:Simon Butler (Sembee)
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First - are you sure that it is Exchange?
If you look in the queues you will see messages hanging around if the server is being abused, because spammer's lists are not very clean.
If the queues are clean, then the source isn't Exchange.

The next step is to simply block SMTP traffic on the firewall except from the Exchange server. Turn on logging and wait. A compromised workstation will soon appear on the logs and can be found and removed.

If you do have messages in the queues on the Exchange server, it is unlikely to be malware, just a compromised account being used to send out spam.

Simon.
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by:ComexIT
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Thanks Simon, do you have a list of steps for me to check etc ?

Thanks
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by:Alan Hardisty
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Try reading my article - link above.

Alan
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by:ComexIT
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Thanks Alan,

I think its the ndr version as it shows from postmaster@domain etc, I have applied the filter etc, Do i need to clear the ques ?
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by:Alan Hardisty
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You should do - it will be NDR's going back to invalid addresses, and you don't want to hit any more blacklists sites and get blacklisted.

Are you on Backscatterer.org?

Alan
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by:ComexIT
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it says not listed but was before etc
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by:Alan Hardisty
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Good - let's hope you stay that way.

Have you resolved the Recipient Filtering yet so it doesn't happen again?

Alan
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by:ComexIT
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yes i have enabled the receip filter etc so that should now be ok, why does it happen .... it's a real pain, we thought it was a pc in network etc
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Alan Hardisty earned 500 total points
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Spammers having fun!  God knows why, but they like to see if they can send their crap out and bombard servers with all manner of rubbish in the hope that one or two make it through and as a result of you not filtering the recipient, the server has to send back NDR's and as the sender addresses are spoofed, some of the NDR's hit unpublished email addresses specifically designed to catch spam and you got caught not filtering invalid recipients.

Hopefully you don't get caught by the other option in my article as that can be very messy and a bit harder to isolate.

Alan
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