Mailing List Message #100557
From: Urs Gruetzner <>
Subject: Re: HELO failure
Date: Thu, 26 Aug 2010 07:40:16 +0200
To: CommuniGate Pro Discussions <>
X-Mailer: Apple Mail (2.936)
(sorry wrong subject in previous mail)
Thanks for explanations 

Instead to change the FQDN for the mail server to, could it be the easiest solution to change the DNS entry for to than instead?

Also the MX entry should be instead of ?

Reason: the forward lookup for points already to the correct IP, so there is no need that the reverese lookup is Also when sending a mail from outside to the lookup of MX of has the correct IP as result. There is no need to use

Thanks for further help

From: Lyle Giese <>
Subject: Re: HELO failure
Date: Wed, 25 Aug 2010 16:08:57 -0500
To: CommuniGate Pro Discussions <>

your MX record for is  

The A record for is

And the reverse lookup for is

The HELO from your server is, not is your domain.  The host name or FQDN(Fully Qualified Domain Name) for your mail server should be

Ideally in today's world these four items should be identical, but in your case they are not.  However to change the HELO greeting in CommuniGate, you need a different license key as that parameter is linked to the HELO greeting.  And that becomes the primary domain in your mail server(postmaster(used for logging in to the webadmin) and blacklist-admin are linked to the primary domain).

That is one thing I find a fault with in Stalker's recommendations.  The license key/primary domain should be, not  That also requires the end users to use their full email address for their login.  That however is a good thing as it makes brute force password attacks harder.  Most of the script kiddies do not use the full email address for their password attacks.

Lyle Giese
LCR Computer Services, Inc.

Gruetzner Urs wrote:
Suddenly we have a problem with the HELO identification (so far only with one recipient server 

can anyone explain why our host is not a fully-qualified hostname?


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