Wildcards in MX Record Domain Names

Kevin Darcy kcd at daimlerchrysler.com
Thu Dec 16 00:44:46 UTC 1999


Joseph S D Yao wrote:

> On Fri, Dec 10, 1999 at 11:16:40AM -0500, Robert Setterlund wrote:
> > Are the below MX records supported in Bind 8.X?
> >
> > *.org   IN   MX   10   firewallrelay.mayo.org
> > *.gov   IN   MX   10   firewallrelay.mayo.org
> > *.        IN   MX    10  firewallrelay.mayo.org
>
> Yes.  But this is probably not the right way of doing this.  You should
> really put a relay host into your sendmail.cf file, to send all
> non-local e-mail to your firewall.

Why? Is it easier to custom-configure dozens or hundreds of sendmail.cf's
than it is one master file on an internal root server? And what if you
want redundancy or load-balancing for outbound email? Sure, you could
probably hack that logic into the sendmail.cf too, but why bother when you
can just add a few more MX records to the internal root?

Plus, you're assuming they're running sendmail or something equally
manipulable...


- Kevin




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