get local sendmail to use MX records

[Gerard Meijer]

Since everybody was sure that the problem was with my fault and something 
had to be wrong with my files, I feel that I have to post the solution, that 
I was send to me to a member from the comp.mail.sendmail newsgroup.

It's really very easy when you know it (as always). As I was sure about, it 
didn't have anything to do with my local-host-names file(s) or another place 
where I accidentilly had left the domain name in.

The solution was to put the following line in sendmail.cf:

O DontProbeInterfaces=True

As I said, very easy, but not if you don't know it. I hope it will become of 
someone someday.

Thanks a lot to everybody who replied to my thread!

Gerard
----- Original Message ----- 
From: "Gerard Meijer" <gmeijer at palmweb.nl>
To: "Ted Mittelstaedt" <tedm at toybox.placo.com>; "Greg Barniskis" 
<nalists at scls.lib.wi.us>
Cc: <freebsd-questions at freebsd.org>
Sent: Thursday, February 24, 2005 9:07 AM
Subject: Re: get local sendmail to use MX records


> I'm 100% sure this is not the case and here is why. I figured something 
> out.
>
> All my servers do the same thing. It has something to do with the reverse 
> DNS pointers of some domains.
>
> For example. I have (another) server running with 20 domains under 4 ip 
> addresses where I never ever touched sendmail or its configuration files. 
> 4 of the domains have a reverse DNS pointer to one of the 4 ips. Sendmail 
> handles 16 domains well (= looks up MX records and delegates the mail to 
> the right server) and tries to handle the mail of 4 domains itself. 
> Needles to say that those 4 domains are the ones that have reverse 
> pointers to the 4 ips attached to that particular server.
>
> I tested this on 5 servers and its the same everywhere.
>
> I hope one of you knows what to do with this information. I spotted the 
> problem now, but I don't know how to solve it. Clearly sendmail prefers a 
> reverse pointer to a domain above looking up the MX records and using 
> them, but how can I let it stop doing that?
>
> Thanks!
> ----- Original Message ----- 
> From: "Ted Mittelstaedt" <tedm at toybox.placo.com>
> To: "Gerard Meijer" <gmeijer at palmweb.nl>; "Greg Barniskis" 
> <nalists at scls.lib.wi.us>
> Cc: <freebsd-questions at freebsd.org>
> Sent: Thursday, February 24, 2005 8:49 AM
> Subject: RE: get local sendmail to use MX records
>
>
>>
>>
>>> -----Original Message-----
>>> From: owner-freebsd-questions at freebsd.org
>>> [mailto:owner-freebsd-questions at freebsd.org]On Behalf Of Gerard Meijer
>>> Sent: Wednesday, February 23, 2005 2:08 PM
>>> To: Greg Barniskis
>>> Cc: freebsd-questions at freebsd.org
>>> Subject: Re: get local sendmail to use MX records
>>>
>>>
>>> I really don't understand it at all now.
>>>
>>>
>>> I emptied my virtusertable and local-host-names files. I
>>> really don't know
>>> why this happens.
>>
>> Did you look in your mailertable file?
>>
>> You have domain.com listed in one of your sendmail config files, that is
>> the only explanation.  Or you have it in /etc/hosts.  or in /etc/rc.conf.
>> it's somewhere.
>>
>> It is problems like this is why when your running commercial servers
>> that you create build sheets for each server.  That is, you record on
>> a separate document EVERY configuration step of any significance that
>> you or anyone else does.  Sorry you had to find this out the hard way.
>> You probably have domain.com secreted in some hack you forgot that you
>> did.  Maybe one of these days when you do a nuke and repave you will
>> remember to start a build sheet.
>>
>> Ted
>>
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