You da pro..
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.
Mike
----- Original Message -----
From: "R. Scott Perry" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, February 10, 2002 5:20 PM
Subject: Re: [IMail Forum] Hotmail problems
>
> >I have problems with Hotmail if the in-addr.arpa zone file for the IP of
my
> >mail server doesn't resolve the IP to the exact same name my server
claims
> >to be in the ESMTP Handshake.
>
> That's a Hotmail issue -- they simply shouldn't be doing that. And I'm
> guessing they don't.
>
> >In otherwords, if your server claims to be mail.webhostdir.com on
> >123.123.123.123
> >then the reverse zone has to resolve 123.123.123.123 to
> >mail.webhostdir.com or
> >hotmail (and some of the other big ISPs) may not accept your traffic.
>
> Not so. There may be a handful of small domains that do this, probably
> because they are experimenting with it, and haven't yet realized it isn't
> useful. First, I'd guess about 40% or so of all mail servers are missing
a
> reverse DNS entry (even though the mail server admin may think it is
> there). Of the 60% that is left, my guess would be that less than 50%
have
> a reverse DNS entry that always matches the "HELO" text ("HELO
example.com"
> with "mail.example.com" as the reverse DNS entry; "HELO
> virtualdomain.example.com" with "mail.example.com as the reverse DNS
entry,
> etc.). That would mean that Hotmail would be rejecting about 70% of all
> legitimate E-mail. That's certainly not an acceptable false positive rate
> for more people.
>
> Hotmail *might* be using that to help determine whether or not an E-mail
is
> spam (weighing in other factors, as well). It's believed that AOL uses
> the lack of a reverse DNS entry to help determine whether or not an E-mail
> is spam (but not accepting or denying the E-mail based solely on the
> reverse DNS entry).
>
> -Scott
> ---
> Declude: Anti-virus, Anti-spam and Anti-hijacking solutions for
> IMail. http://www.declude.com
>
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