Our outgoing email carries the name of our internal LAN domain (Microsoft domain controller).

Some of our business partners are bouncing our email back to us, and the error report shows the internal Fully Qualified Domain Name of our Exchange server - the private host name and domain name. I suspect the Exchange server is somehow stamping the outgoing email with this private name.

I've spoken with our ISP's Tech support regarding PTR records in their DNS - and they have nothing that would indicate our internal domain name. That's why I suspect our very own Exchange server.
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Add an spf record to your dns.
What do you think an SPF record will do?  It is not the magic bullet for anything, and sure wont help with an incorrect SMTP Greeting.

TangenTWhit, ensure that your SMTP Greeting is correct -> http://www.block.net.au/help/SMTP-Greeting

Also, put your domain in here, and see what else is flagged; http://www.dnsreport.com


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