[69314] in North American Network Operators' Group
Re: Mailserver requirements
daemon@ATHENA.MIT.EDU (Daniel Roesen)
Mon Apr 5 18:55:44 2004
Date: Tue, 6 Apr 2004 00:55:09 +0200
From: Daniel Roesen <dr@cluenet.de>
To: NANOG <nanog@nanog.org>
Mail-Followup-To: NANOG <nanog@nanog.org>
In-Reply-To: <4071D54B.2080507@nipper.de>; from arnold@nipper.de on Mon, Apr 05, 2004 at 11:53:15PM +0200
Errors-To: owner-nanog-outgoing@merit.edu
On Mon, Apr 05, 2004 at 11:53:15PM +0200, Arnold Nipper wrote:
> >>of course this server does have a reverse mapping. But this reverse
> >>mapped doamin does not have an MX record.
> >
> > Does it have an A RR?
>
> It also does have an A RR. And the forward mapping does also match the
> IP address.
OK, so the check is even broken in what it probably tries to verify...
that the reverse-domain of the sender IP would (possibly) be able to
receive mail (bounces).
> > Anyway... it's a heuristic which definately does give false positives.
> > The only requirement is that IF a domain/host accepts mail there MUST be
> > a postmaster@ address.
>
> In this case the host *sends* mail ...
Sure. I was discussing the requirements for domains regarding email.
In this specific case, "domain" being the domain of the PTR of the
sending MTA host.
Regards,
Daniel
