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 have seen AOL accept on some servers and reject
on others. Guess they did not have them all configured the same. If there
were just one server, then it should always reject the email. Typically the
log will show an error message like 'Domain must resolve' from the remote,
when this is encountered.
I don't ever remember this being a 'requirement' by RFC, but maybe Scott and
I are not thinking about the same ones!
Daniel Donnelly
________________________________________________________
----- Original Message -----
From: "Scott Perry" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, March 02, 2001 10:51 AM
Subject: Re: [IMail Forum] Delivery problem
> > On another point, I don't think we've ever set up reverse dns on
> > our system. Is this necessary?
>
> I believe it is required by an old outdated RFC somewhere (that ALL hosts
have a reverse DNS, not just mail servers), but many mail servers do not
have a reverse DNS entry. There may be a few mail servers that reject mail
coming from IPs that have no reverse DNS, but I haven't heard of any mail
servers that actually do that.
>
> > What's required?
>
> You'll need to talk to your ISP to find out how to get the reverse DNS
entry.
>
>
> --
> -Scott
>
> Declude: Anti-virus and Anti-spam solutions for IMail.
http://www.declude.com
> --
>
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