MX Record

[David Botham]

> -----Original Message-----
> From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org] On
> Behalf Of Warrick FitzGerald
> Sent: Monday, October 21, 2002 3:22 PM
> To: comp-protocols-dns-bind at isc.org
> Subject: MX Record
> 
> Hi All,
> 
> Am I correct in assuming that one needs to explicity define an MX
record
> for
> each sub domain defined within a zone file.
> 
> For Example.
> 
> If I own the domain DomainA.com and I add an entry that looks like
this
> 
> DomainA.com.    IN    MX     10     mail.Domain.com
> 
> Anyone sending an email to xx at domainA.com will use that explicit
record.
> 
> What happens id someone now sends an email to xx at subdomain.DomainA.com
> 
> With the resolver fail trying to find the MX record for that domain ?
If
> so
> am I correct in assuming you need to add another MX record that looks
like
> this
> 
> SubDomain.DomainA.com.    IN    MX     10     mail.Domain.com

(except for the fact that you left off the trailing dot after
mail.Domain.com. <- dot is really important)
Yes, the above would be the preferred method.  However, if the above MX
RR does not exist either of the following would work (in the order
listed):

SubDomain.DomainA.com.    IN    A     192.168.1.5
(if there is no MX RR for the name in question, if there is an A RR,
that will be used)

*.DomainA.com.		  IN	  MX 10 mail.Domain.com.
(if there is no MX RR *AND* there is no A RR, then, if a wildcard exists
it will be used)

Be careful when you use wildcards, they don't act the way you might
think they would.  Read DNS & BIND, 4th Edition, pages 341 and 503.

Thanks,

Dave...


> 
> In order to get the sub domains email to work ?
> 
> Thanks
> Warrick
>