Mailing List Message #93982
From: Vesse Michel <>
Subject: Re: Sender IP must resolve
Date: Thu, 07 Feb 2008 11:31:00 +0100
To: CommuniGate Pro Discussions <>
Thank you Graeme
The PTR must point to IP public
my server is behind FW and have Nat since IP public=>DMZ
last yars i have assk my provider to record a PTR for my server.
i have main domain for the server and a PTR for this domaine:
IPpublic1 PTR maindomain1 =>DMZ.Nat.IP1
all reference on is by "maindomain1"

I have more domaine on this server  does i want to record a PTR for earch like :
IPpublic2 PTR otherdomain2 =>DMZ.Nat.IP2
IPpublic3 PTR otherdomain3 =>DMZ.Nat.IP3

From:   Graeme Fowler <>
Subject: Re: Sender IP must resolve
Date: Thu, 07 Feb 2008 09:18:42 +0000
To: CommuniGate Pro Discussions <>
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On Thu, 2008-02-07 at 10:14 +0100, Vesse Michel wrote:
I have this message when i send email:

Failed to deliver to ''
SMTP module(domain reports:
return-path address <> rejected
501 5.7.1 <>... Sender IP must

This means the IP of your mail server has no PTR (reverse DNS), or it
has a PTR which does not resolve back to a valid (or the same) IP

If the IP address in question is in a block over which you have
delegated rights for reverse DNS, add a valid record. If it isn't, speak
to your ISP.


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