[141148] in North American Network Operators' Group
Re: messagelabs.com contact - SMTP-side domaincheck checks IPv4 only,
daemon@ATHENA.MIT.EDU (Matt Sergeant)
Sun Jun 5 18:08:54 2011
Date: Sun, 05 Jun 2011 18:07:34 -0400
From: Matt Sergeant <msergeant@messagelabs.com>
To: Jeroen Massar <jeroen@unfix.org>
In-Reply-To: <4DEB830D.1020607@unfix.org>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
I'll get someone to contact Ford and see what they are running. From
google it looks like Exchange. Is this a known bug with Exchange? If so
I think there's bigger problems than messagelabs :)
Jeroen Massar wrote:
> As the subject states,
>
> MAILER-DAEMON@messagelabs.com:
>
> <....@ford.com>:
> Connected to 136.1.7.8 but sender was rejected.
> Remote host said: 501 Sender domain must exist
>
> As it obviously checks only the first MX record if there are A records,
> and if there are none it rejects it. This while there are AAAA records
> on the first MX, and even A records on the remaining MXs. Thus a proper
> fix would already be to check the other MXs and of course to check for
> AAAA too ;)
>
> And that affects all customers at messagelabs, thus if somebody can pass
> that along to them to fix it, that would be great ;)
>
> Oh and of course the check is also there for postmaster@ thus no way to
> tell them through that route.
>
> Greets,
> Jeroen
>
>
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