RE: [cobalt-users] HELP QUICK!! Problem with MX record not pointing to outside Email server

["Andy Brown" <andy.brown@xxxxxxxxxxxxx>]

> I'm trying to setup the mx record to point to an email server 
> at another location.  They 're not receiving the emails, and 
> they already have email address on our server.  I'm thinking 
> that maybe the email accounts already exsisting on our server 
> are causing the problems but wouldn't pointing the mx record 
> to the new IP solve the problem?  And is the configuration 
> below correct?
> 
> 
> test.com      209.1.218.1
> pop.test.com      66.1.44.1
> www.coloreflections.com      209.1.218.1
> 209.1.218.1/24      test.com
> 66.1.44.1/24      pop.test.com
> 209.1.218.1/24      www.coloreflections.com
> MX : test.com    pop.test.com


Okay, what I think the problem here is that Sendmail is still accepting
emails for this domain in mistake. This is down to a configuration
directive within sendmail itself, because what it does is probe's the
interface cards and IP's and attempts to automatically accept mail for
the reverse dns entries for these domains.

To stop this behaviour, open up
/etc/sendmail.cf

And add in a line:
O DontProbeInterfaces

Then /etc/rc.d/init.d/sendmail restart


To test what interfaces/domains sendmail is listening on, go to your
ssh/telnet shell, and type in:
sendmail -bt

It will then wait for more input, so type in:
$=w

This will then list all the domains the Raq will be attempting to
receive email for (authoritively)

Hope that helps.

Andy
andy@xxxxxxxxxxxxxxxxxxxxx
http://ineedlinux.info/