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08.26.2008 at 06:17AM PDT, ID: 23678300
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7.4

Spam bypassing mail filter?

Asked by casedog21 in Email Anti-Virus, Spam Black Holes, Simple Mail Transfer Protocol (SMTP)

Tags: , ,

My company provides a spam service to our customers.  The customer points their mail records to us and mail is filtered then it is delivered to the customers servers.  We require that the customer locks down their servers to the ip addresses that we give them to recieve mail.
That being said....

I have a customer that has our service and for some reason mail is getting around the filter.  I personally locked down their server and applied that policy to exchange with the latest updates.  I also told the server not to accept any local smtp traffic either.  They don't use copy machines that email attachments or anything.  My question is.....

a) outlook doesn't use port 25 to send to the exchange server does it?
    If it does then it sounds like my policy is not working.

b) what are some good steps to trouble shoot this internally?
    I am running wire shark and I see no traffic that is pointing to the local network on port 25
    just the connections from the server to our filters.

Thanks in advanced..  

Casey

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[+][-]08.26.2008 at 06:26AM PDT, ID: 22314337

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[+][-]08.26.2008 at 11:15AM PDT, ID: 22317639

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[+][-]08.26.2008 at 11:36AM PDT, ID: 22317858

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About this solution

Zones: Email Anti-Virus, Spam Black Holes, Simple Mail Transfer Protocol (SMTP)
Tags: Microsoft, exchange, 2003
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Solution Provided By: tigermatt
Participating Experts: 1
Solution Grade: B
 
 
 
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