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04.21.2008 at 08:13AM PDT, ID: 23339814
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stop a spammer spoofing my domain

Asked by strick9 in Simple Mail Transfer Protocol (SMTP), Exchange Email Server, Anti-Spam Email Software

Tags: Microsoft, Exchange, 2003, SMTP

One of my users came in this morning and had 600 non-delivery reports in her Inbox.  I think this has been referred to as the "Reverse NDR attack".  This is NOT the first user on my network to have this problem.  It seems this spammer I picking on a different user every week.  The problem, in case you don't already know, is this.......  
1.)  Spammer sends an email to "randomcrap@somedomain.com" and for the from puts "user@mydomain.com"
2.) The server at "somedomain.com" does not have a user name "randomcrap".......so it sends a NDR to "user@mydomain.com".......not knowing the email address is spoofed.
3.) user's inbox fills up with these NDRs and the admin at "somedomain.com" is getting mad because "mydomain.com" is spamming him.

I'm pretty sure there is no way to stop the spammer from sending this junk in the first place.  But at the very least, could someone tell me how to stop my user's inboxs from filling up with this crap??

Thanks for your help and insights.

Kindest regards,
BryceStart Free Trial
 
Keywords: stop a spammer spoofing my domain
Title
1 Spam mail as NDRs(Non Delivery Rep…
2 Locating spammer
3 spammers
4 Spam bring returned as NDR's
5 How do I stop mail being sent out by sp…
6 Non Delivery
 
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[+][-]04.21.2008 at 08:17AM PDT, ID: 21402740

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[+][-]04.21.2008 at 08:24AM PDT, ID: 21402830

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Zones: Simple Mail Transfer Protocol (SMTP), Exchange Email Server, Anti-Spam Email Software
Tags: Microsoft, Exchange, 2003, SMTP
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Solution Provided By: grblades
Participating Experts: 5
Solution Grade: A
 
 
[+][-]04.21.2008 at 09:00AM PDT, ID: 21403244

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[+][-]04.21.2008 at 09:15AM PDT, ID: 21403412

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[+][-]04.21.2008 at 09:46AM PDT, ID: 21403666

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[+][-]04.21.2008 at 09:56AM PDT, ID: 21403732

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[+][-]04.21.2008 at 09:57AM PDT, ID: 21403744

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[+][-]04.21.2008 at 10:02AM PDT, ID: 21403793

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[+][-]04.21.2008 at 10:18AM PDT, ID: 21403961

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[+][-]04.21.2008 at 10:47AM PDT, ID: 21404247

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[+][-]04.21.2008 at 11:00AM PDT, ID: 21404382

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[+][-]04.21.2008 at 09:28PM PDT, ID: 21408100

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[+][-]04.22.2008 at 05:38PM PDT, ID: 21416823

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