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So just to update -- I called my ISP who we have 5 static IPs with. Explained to them what was going on. They said they would set up a reverseDNS (she said it's also known as PTR) for the hostname mail.mydomain.org to point to one of the specific statis IPs we have. At my end here I've programmed the firewall to forward and send out messages coming in on that specific IP to go to the mail server I built. It will take some time to propagate of course, but is that the same thing as what you were referring to above as the MX record or is that another step?
Thank you
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