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Mailbox unavailable. The server response was: 5.7.1 Message rejected as spam by Content Filtering.

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Last Modified: 2015-03-09
Hi I have a unmanaged dedicated server in a data center on that I have a few website but one of them I have just set up a new site using nop commerce and works great but when it sends mail to my internal server I get an error message in the logs saying "Mailbox unavailable. The server response was: 5.7.1 Message rejected as spam by Content Filtering." I don't know where to look, is this an issue with the dedicated server or my internal one with exchange? the other thing I don't get is if I send a test message form nopcommerce it works fine, plus all my other sites are ones I have wrote myself and the emails go to the same server in the same way and works fine but are different email address. I read some where to just run a command "Set-ContentFilterConfig -BypassedSenderDomains yourdomain" but which server and in what program as does not look like a cmd.exe command. Please help.
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