Our exchange server 2013 is sending lots of spams. We checked that server is not and open relay. It seems that one of the system or server is compromised and sending spams. How do i check the origin

Gaurav Nag
Gaurav Nag used Ask the Experts™
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Our exchange server 2013 is sending lots of spams. We checked that server is not and open relay. It seems that one of the system or server is compromised and sending spams. How do i check the origin of the SPAM. Where from it is generating?
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Commented:
Check also that you dont have a workstation on your domain that is infected with something that is generating the email
Senior Systems Admin
Top Expert 2010
Commented:
Make sure it's actually your Exchange server sending the spam, first. Get on your firewall and block Outgoing port 25 for everything but your mail server and/or spam filter. Once you have a rule to block it, you can check your firewall logs to determine which system is sending the spam (assuming it stops when you do this) by seeing which systems get flagged in the logs as being blocked against that rule.

Commented:
Gaurav,  Is this still an issue?

  1. What evidence do you have indicating the spam is coming from your server
  2. If you have a sample email, have you checked the headers

Its possible that the email is spoofing your email address/es and is coming from somewhere else.
Seth SimmonsSr. Systems Administrator

Commented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: Adam Brown (https:#a42119882)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

seth2740
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