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Email is rejected

I'm not sure what is going on. When a sender sends an email to my customer how is on SBS 2008/Exchange 2007 the email does not get to the SBS box and the sender recieves this error back
" the following message to _______ is undeliverable. The reason for the problem: Other mail system problem. 550-'5.7.1 Message rejected as spam by content filtering

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Gerhardpet
Asked:
Gerhardpet
1 Solution
 
R--RCommented:
This indicates that the message is rejected by content filter.
I belive due to some words it is blocked.

Send a simple test mail and check.
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sivanovCommented:
any chance the the sender domain is in any blacklist? :-)
could you test with another sender from any free mail (hotmail, gmail, yahoo, whatever)
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GerhardpetAuthor Commented:
I sent an email from a yahoo address and it did not bounce back.
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WORKS2011Austin Tech CompanyCommented:
What I often do is take the domain that is being rejected and check it against the blacklist on MXToolBox. Often you'll see that they are on a blacklist or have a DNS issue, report this back to the sender.

Or, you may have the content filter adjusted to tight. Click here for a good understanding how it works.
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GerhardpetAuthor Commented:
Thank you WORKS2011

We are using Untangle to filter spam so I have now disabled spam filtering in SBS. I'm sure it will solve my problem...
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