[CentOS] one server handled sendmail added two more servers messes things up

Jerry Geis geisj at pagestation.com
Fri Jan 1 20:05:35 UTC 2010

lists-centos wrote:
> What IPnumbers did you give the two new machines? What does your DNS
> look like.
> >From the outside, mail will be delivered to the MX- (or if that
> doesn't exist A-) record machine (based on the IPnumber in the DNS
> record) for the FQDN on the message. 
>   - Rick
> ------------ Original Message ------------
>> Date: Friday, January 01, 2010 02:27:12 PM -0500
>> From: Jerry Geis <geisj at pagestation.com>
>> To: CentOS ML <centos at centos.org>
>> Subject: [CentOS] one server handled sendmail added two more
> servers messes things up
>> Hi all,
>> I had one server running centos 4.7 i686  everything was fine with 
>> incoming mail.
>> I now added two more servers centos 5.4 x86_64 and gave them
>> machine  names all
>> part of the same domain as machine 1. I noticed that incoming
>> emails are  being
>> round robined to all three machines.  At this time I really just
>> want  the one original machine
>> to handle my incoming email... The other two new machines are for
>> other  purposes.
>> How do I tell the two new machines that all incoming email send to 
>> machine 1.
>> Is there an easy way to do that? At this point I just turned off
>> the two  new machines
>> and all mail is coming into the original machine just like before.
>> Thanks,
>> Jerry

All three machines have the same FQDN.
something like A.mydomain.com, B.mydomain.com, C.mydomain.com

The IP numbers are X.Y.Z.170, .171 and .172

All three machines have MX records. they all have the same domain name.

It is a big deal to request changes from the provider so I was hoping 
there was a way
to just tell the two new machines that incoming email to them just send 
on over to the the
first machine.

Is there a way to do that - or am I going about this the wrong way?


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