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When reading header content in MS outlook 2003 how do you know what is real and what is not?

Posted on 2006-10-31
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Last Modified: 2010-04-08
Good Day Experts,

I'm going over a few junk e-mails to see who is sending them to us by viewing their Headers.  And one of them said that the "Received" was from our WAN Ip address' DNS reference.  Then it says that it is received by our internal LAN DNS name of our Exchange Server.  Is everything listed in these headers not tainted by spammers or can they do something to make it look like the e-mail is coming from our own DNS name?  Or am I reading this wrong?  

Many Thanks,

ellsworth
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Question by:ellsworth2000
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Expert Comment

by:Serena Hsi
ID: 17843938
It's called spoofing, and yes, they can make it look like your own ISP or domain is the one spamming.

How secure is your mail port? Do you have a firewall?
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Serena Hsi earned 500 total points
ID: 17844006
Some light reading:

Microsoft Security Bulletin MS04-026
http://www.microsoft.com/technet/security/Bulletin/MS04-026.mspx

How your Exchange server can get blacklisted
http://searchexchange.techtarget.com/originalContent/0,289142,sid43_gci1182936,00.html

Anti-Spam Enhancements in Exchange Server 2003 Service Pack 2
http://www.microsoft.com/technet/prodtechnol/exchange/2003/sp2security.mspx

An example of VPN server spoofing
http://www-rocq.inria.fr/who/Philippe.Sultan/vpn/spoofed_vpn_server.html
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Author Comment

by:ellsworth2000
ID: 17844015
We have a Netgear ProSafe VPN Firewall FVS338.
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Author Comment

by:ellsworth2000
ID: 17844024
Oh just to let you know our E-mail server is Exchange 2000 on SBS 2000
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Author Comment

by:ellsworth2000
ID: 17844030
Is there a way to trace who it was truely sent from?
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