>But all I know is when I fixed up my reverses then delivery problems to
>hotmail, aol, netscape, and yahoo disappeared. It may have been magic,
>though. BTW, I check rdns and weigh it into my own calculations if
>something is likely spam or not. But, I guess I'm a little guy who hasn't
>realized it isn't useful, yet.
Well, checking the last 10 mail servers to send mail to the IMail forum,
only 40% had reverse DNS entries that matched the "HELO" text they were
sending. That means that if Hotmail, AOL, Netscape, etc. require the
reverse DNS match the HELO text, those users would get only about 40% of
the E-mail from this list.
The other 60% either had no reverse DNS entry, bogus HELO text ("hostname"
rather than "hostname.example.com"), or HELO text that didn't match the
reverse DNS entry.
Of course, some mail servers will use a mismatched HELO/revdns along with
other factors to determine if an E-mail should be treated as spam. I think
that isn't good (IE virtual domains, where the HELO text really should
match the domain sending the mail, rather than the FQDN of the server), and
that only a missing reverse DNS entry should be used (along with other
factors) in determining whether an E-mail should be treated as spam. But
that's just my personal opinion. :)
-Scott
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