Thanks for the info Scott. Helps my understanding a lot. The problem is that
I'm getting this message:
"250-rly-yg05.mx.aol.com peer name unknown"
which I'm guessing means that either their relay server isn't working or
their mail server doesn't recognize my server.
Troy
----- Original Message -----
From: "R. Scott Perry" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, August 30, 2001 11:15 AM
Subject: Re: [IMail Forum] Emails to AOL users
>
> >In the past, I have seen AOL drop mail if the reverse DNS does not
reslove
> >to the domain in question. It seems you are hosted by twinstar and if the
> >AOL mailserver does a reverse DNS lookup and it resolves to Twinstar it
may
> >beleive it is spam and drop it with no reply.
>
> Just a quick clarification about reverse DNS lookups. There are several
> ways that a mail server can drop (or do other unwanted stuff to) mail
based
> on reverse DNS entries:
>
> [1] Drop the mail if there is no reverse DNS entry. This is rare, but
> rumor has it that AOL did/does this.
>
> [2] Drop the mail if the reverse DNS entry doesn't exist, or if it exists
> but doesn't match the host name in the SMTP banner. No mail servers that
I
> know of do this, which is a good thing, because they wouldn't receive mail
> from any IMail server (IMail incorrectly reports "X1" as the host name).
>
> [3] Drop the mail if the reverse DNS doesn't exist, or it does exist but
> doesn't match one of several other things (such as the MAIL FROM:
> domain). This almost certainly isn't used, as it wouldn't let you use
> virtual domains.
>
> [4] Drop the mail if there is no reverse DNS entry, or if it exists but
> doesn't have a corresponding A record (IE reverse DNS for 127.0.0.1 is
> "1.0.0.127.in-addr.arpa" or "localhost", neither of which has an A
> record). This is similar to #1.
>
> So the key is simply to make sure that you have a reverse DNS entry set up
> for the IP address of the mail server (the RFCs require this of all hosts,
> but the majority of hosts don't have the reverse DNS entry). You don't
> have to worry about mixing and matching the PTR record to various possible
> combinations of host names and domain names.
>
> If you see "REVDNS:" or "MISSING_REVERSE_DNS" in replies to E-mails you
> send to us, it means that you are missing this reverse DNS entry. You
> won't see this in replies to E-mail to this list, though, since we just
> check the "first hop" (the IMail server).
>
> -Scott
> ---
> Declude: Anti-virus, Anti-spam and Anti-hijacking solutions for
> IMail. http://www.declude.com
>
>
>
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>
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