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Exchange - Some outbound messages being marked as spam and not being sent.

We just moved from outsourced e-mail to an internal exchange 2003 server. Everything works great except when users send e-mail to some external recipients they get NDRs.

The two we have had give the follow explanations ...

           You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <xxxxxxxxxxxxxxxx #5.7.1 smtp;554 5.7.1 The message from (<xxxxxxxxx>) with the subject of (FW: xxxxxxxxxx.) matches a profile the Internet community may consider spam. Please revise your message before resending.>


The following recipient(s) could not be reached:

      'xxxxxxxxxxxxxx' on 10/17/2007 4:00 PM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <twhexc.twhouse.com #5.5.0 smtp;554 Sending address not accepted due to spam filter>

Any thoughts on this?
1 Solution
Your DNS is probably not configured correctly.
Put your domain in to dnsreport.com and see what errors it flags in the mail server section. It is probably reverse DNS and SMTP banner errors.


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