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August 29, 2008 08:09pm pdt
 
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Is there any way to stop/reduce the e-mail spoofing/phishing of my domain? 2 part question

Tags: Exchange 2003, Spoofing/Phishing
2003 SP2 Exchange on 2003 SP2 Std Ed. Server

Part 1:
Random users throughout my domain are getting NDR's generated by remote servers for e-mail they did not send. The messages are not originating from our network; i sat down and looked through 50 pages of inbound/outbound traffic, as well as checking ESM Message tracking. ALL e-mail outgoing was legitimate (inbound would be Part 2). I'm sure someone/thing is spoofing the domain user's e-mail address. Any way to stop this, or reduce the amount? Is there a way to stop the 'bogus' NDR's from being delivered to the end-user without stopping legitimate NDR's? Would an Anti-spam software/device stop or help this?

Part 2:
They are also getting e-mail from themselves for viagra, "natural male enhancement", etc.
IE: jdoe@mydomain.com sent jdoe@mydomain.com an e-mail about Viagra
I can find each message in the Inbound log, by matching the header's originating address to the inbound traffic. I know i can go through one by one adding them to the exchange 'blacklist', but this is very tedious. Is there a setting in exchange that will keep users from sending themselves e-mail?

Points will be split for this question, unless you SOLVE both problems in a single post. Feel free to ask questions, as i get the updates on my phone.

Thanks in advance.
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Question Stats
Zone: Software
Question Asked By: mhdcommunications
Solution Provided By: hypercat
Participating Experts: 4
Solution Grade: A
Views: 4
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Rank: Wizard

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