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.
Many mail admins are more likely to manually block an IP if a complaint is received and it does not have a PTR entry that matches the forward lookup.
Another factor to consider is the greeting that the mail server states when you telnet (smtp) to it. Does the mail servers greeting message have a FQDN?
A correct example would be:
"220 ms-smtp-04.nyroc.rr.com ESMTP Welcome to Road Runner. WARNING: *** FOR AUTHORIZED USE ONLY! ***"
Vs.
Incorrect: "220 mail damon ESMTP ..." or "220 bigcompany ..." or "220 10.10.10.10" (Ip used only as example)
-Greg.
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