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06.03.2007 at 07:27PM PDT, ID: 22610238
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After exchange NDR Attack

Asked by ldunscombe in Spam Black Holes, Email Software, Exchange Email Server

Tags: ndr, exchange, attack

Hi Experts

We have recently been the victim of an NDR attack on our exchange server (2003) on server (2003) and followed all the instructions found on this site to rectify the problem including recipient filtering, turning of NDR's, tarpitting and cleaning out the bad mail and email queues.  All seems to be working fine in so far as mail is being delivered and received as I would expect.  My question is however I am still receiving error messages in the application event log saying that the server is unable to relay for (fictitious email address). While it would appear that my server is no longer replying, storing or queueing these emails I am concerned that the messages may still be being sent to our server consuming our available bandwidth. Is this likely to be the case, if so how can I stop them getting this far or am I barking up the wrong tree altogether.

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[+][-]06.03.2007 at 10:37PM PDT, ID: 19206344

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[+][-]06.03.2007 at 11:32PM PDT, ID: 19206493

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[+][-]06.04.2007 at 12:06AM PDT, ID: 19206574

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[+][-]06.04.2007 at 12:15AM PDT, ID: 19206614

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[+][-]06.04.2007 at 03:51AM PDT, ID: 19207420

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[+][-]06.04.2007 at 03:30PM PDT, ID: 19212706

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[+][-]06.04.2007 at 03:43PM PDT, ID: 19212796

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About this solution

Zones: Spam Black Holes, Email Software, Exchange Email Server
Tags: ndr, exchange, attack
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Solution Provided By: r-k
Participating Experts: 2
Solution Grade: A
 
 
[+][-]06.04.2007 at 03:48PM PDT, ID: 19212831

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[+][-]06.04.2007 at 03:50PM PDT, ID: 19212844

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[+][-]06.04.2007 at 04:06PM PDT, ID: 19212951

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