> Actually, many of the big providers, AOL, Mindspring, Earthlink,
> etc..., use Sendmail servers and are configured to reject email
> from SMTP servers that do not have PTR records.
I used to do some consulting for a company that had no PTR record for their mail
server, yet nobody ever mentioned that E-mail was bouncing. The CEO had an account on
AOL that he would send mail to. They put the PTR record on the "back burner" until
people started complaining, but nobody did.
Then again, AOL has a bad habit of deleting E-mail it doesn't like, rather than
rejecting it or sending a bounce message. So it's possible that they just didn't know
that the E-mail was killed by AOL.
> I don't ever remember this being a 'requirement' by RFC, but maybe
> Scott and I are not thinking about the same ones!
The reference I found just now isn't a requirement ("must"), but is an "almost
requirement" ("should"). From RFC1912: "For every IP address, there should be a
matching PTR record in the in-addr.arpa domain".
--
-Scott
Declude: Anti-virus and Anti-spam solutions for IMail. http://www.declude.com
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