A message from one of my users was rejected. The 550 reply included a link. The page gives this as the explanation:
Possible bogus mail. The IP address of the server that connected directly to our mail server had a reverse DNS lookup that resolved to a dialup or DSL network. Legitimate mail servers have their own reverse DNS lookups. If you are running a legitimate mail server that has this problem, your ISP should be able to make a DNS change for you. You may want to contact your mail administrator about getting this problem resolved.
Do I need to ask bellsouth to change the ptr to my server's name? There is an entry already.
They are confused. They are saying that the reverse DNS of your IP resolves to a "dialup or DSL network" -- but they almost certainly can't know that. What they really mean is that your reverse DNS entry looks similar to those that dynamic IPs have (with a bunch of numbers in there), and that they want you to have a vanity reverse DNS entry. Depending on your Internet provider, you may or may not be able to get one (and may or may not have to pay for it).
Fortunately, decent anti-spam software won't block your mail, so this is a non-issue for most people. To get around it for an individual mailserver, you can either route the E-mail through your Internet provider's mailserver in your mail client, or add a HOSTS file entry for their domain on your mailserver (pointing to the IP of your Internet provider's mailserver).
-Scott
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