One of the most common reasons we see e-mail bounce off our firewall is
the reverse dns entry for the mail server doesn't match the address of
the sending mail server. You can use dnsreport.com to help trouble shoot
a lot of dns related issues. Another useful website is dnsstuff.com, one
handy item is the checking to see if your mail server is black listed by
any of the popular (and not so popular) lists.

-Lane

> -----Original Message-----
> From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On
Behalf
> Of Wirt Atmar
> Sent: Tuesday, August 06, 2002 9:11 AM
> To: [log in to unmask]
> Subject: Re: Sendmail question
>
> Ron asks:
>
> > When we use sendmail, it seems to have no problem sending to Yahoo.
But
> if
> > you send something to AOL, I get errors.  Is there something that
I'm
> missing?
>
> I don't know what the specific problem is that you're having with AOL,
but
> AOL has a very aggressive set of anti-spam filters in place (which I
> appreciate greatly). The first line of defense that they engage is
simply
> verifying that the sender's address is real.

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