Internal Domain and Netbios name in email header.

Posted on 2008-11-13
Last Modified: 2013-11-30
Im running Exchange 2k7EE SP1 with hotfix rollup 4 on Server 2008EE.  Although Im not having any issues sending or receiving mail, my header seem to be incorrect (not sure) as my internal mailservers name and domain (.local) is shown in the header.  I know for a fact when running exchange 2000, my internal name/domain was never listed.  But the thing is, SPF passes when sending to my gmail account. Attached is my header.  At this point, I have no reports of failed sent message.  But this header really concerns me.  Is this wrong or is it ok?



INTERNALDOMAIN= my internal domain name...... ie mydomain.local
NETBIOSNAME=  the internal name of my compter when installing windows ie. server1
xx.xx.xx.xx = My EXTERNALIP address on my Firewall which NATs to my mail server.

Received: by with SMTP id t2cs16544ybc;
        Thu, 13 Nov 2008 05:46:14 -0800 (PST)
Received: by with SMTP id d11mr2756003ybg.103.1226583973358;
        Thu, 13 Nov 2008 05:46:13 -0800 (PST)
Return-Path: <>
        by with ESMTP id 4si1729403gxk.36.2008.;
        Thu, 13 Nov 2008 05:46:12 -0800 (PST)
Received-SPF: pass ( domain of designates xx.xx.xx.xx as permitted sender) client-ip=;
Authentication-Results:; spf=pass ( domain of designates xx.xx.xx.xx as permitted sender)
 ([fe80::89f7:5b26:13f1:bb0f]) by NETBIOSNAME.INTERNALDOMAIN.local
 ([fe80::89f7:5b26:13f1:bb0f%15]) with mapi; Thu, 13 Nov 2008 08:46:10 -0500
From: "MY NAME" <>
To: "''" <>
Date: Thu, 13 Nov 2008 08:46:11 -0500
Subject: test
Thread-Topic: test
Thread-Index: AclFljBTvOVTGzkoRvmoRg1wIAEzBw==
Accept-Language: en-US
Content-Language: en-US
acceptlanguage: en-US
Content-Type: multipart/alternative;
MIME-Version: 1.0

Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
Question by:nebula72
    LVL 3

    Assisted Solution

    the spf passes because the sender adress matches the ip-adress of the server.
    You should be able to set up the dns-name in the properties of the smtp-server. A correct dns name, that can be reverse-lookup-ed gives you a better chance to pass spam filters.

    Author Comment

    Yea.. I thought i set that up arleady.. I put in the external hostname in the "specify fqdn" field of the general tab in Hub Transports Send connector area but it still gives me the internal name.  I guess im missing something.

    any help would be appreciated.

    Accepted Solution

    After some research it seems that its ok to have the netbios name in the header and I have been running fine with it.


    Author Comment

    OK to close.

    Author Comment

    Although I resolved this on my own, I would like to have the question left in the database as this might help others.

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