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Somebody is using our mail server....

Posted on 2004-04-07
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Last Modified: 2010-04-09
we are runing exchange 2003 behind ISA server. from our virus program i can see that the mail server sending emails to unrecognized addresses that are failed because they are bogos addresses,and after some time they goes to the bedMail directory
we permit the server to relay email only from one internal ip address. where is our hole? and how we can plug it?
many thanks in advance to the guru's
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Question by:Info_user100
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What90 earned 1000 total points
ID: 10779940
Those are NDR's and there inst't much you can do about it.

You can automatically reject emails the come to your domain which aren't addressed to real addresses on your Exchange server.

Follow this:
http://www.winnetmag.com/MicrosoftExchangeOutlook/Article/ArticleID/40756/40756.html
or
http://blogs.msdn.com/dlemson/archive/2003/10/17/52019.aspx


More info on NDR's:
http://support.microsoft.com/default.aspx?scid=kb;en-us;316617&Product=exch2003
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