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Set up PTR record (Reverse DNS) for AT&T connections

If you need to set up a PTR record for an AT&T static IP, go to http://attis-dns.sbcglobal.net and fill out the form for reverse DNS from their server IP to their domain name (example: mail.domain.com or remote.domain.com).

They will respond that it is complete or for more information. Test using mxtoolbox.com by typing the server IP in and doing an ‘smtp diag’ to see that reverse dns banner matches. Sometimes you need to forward them an email from an existing person in the company to prove you are legitimate.