MX records

[David Botham]

> -----Original Message-----
> From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org] On
> Behalf Of Karyn Williams
> Sent: Monday, December 09, 2002 3:47 PM
> To: bind-users at isc.org
> Subject: Re: MX records
> 
> 
> We get mail addressed to:
> 
> user at calarts.edu
> user at muse.calarts.edu
> user at indy1.calarts.edu
> 
> and it should all go to muse.calarts.edu.
> 
> If muse is the mailhost, why does it need an MX record ?

Technically, it probably does not *need* and MX RR, however, it is a
good idea to have one for completeness.  Most MTA's will deliver mail to
the A RR if there is no MX RR.  Finding that A RR would require an
additional query.  I would include the MX RR unless I had a *really*
good reason not to...


Thanks,

Dave...



> 
> 
> At 10:38 AM 12/9/02 -0700, Cricket Liu wrote:
> >
> >Karyn Williams wrote:
> >> All mail send to this domain should go to muse.calarts.edu. From
what
> >> I have read MX records are only for mail addressed to one
host/domain
> >> to be forwarded to another. Is there any reason to have the MX
record
> >> pointing to the addressed host (1) ?
> >>
> >> calarts.edu.    IN      A       198.182.157.5
> >>                 IN      MX 0    muse
> >> ;
> >> ;
> >> ;
> >> ; IP block 198.182.157.0 through 198.182.157.255
> >> ;
> >> www.calarts.edu. IN     CNAME   muse
> >> indy1           IN      MX 0    muse
> >> muse            IN      A       198.182.157.5
> >>                 IN      MX 0    muse
<---------------(1)
> >
> >Only if you expect, or want to allow, people to address mail
> >to <user>@muse.calarts.edu.
> >
> >cricket
> >
> >Men & Mice
> >DNS Software, Training and Consulting
> >www.menandmice.com
> >
> >The DNS and BIND Cookbook, now available!
> >http://www.oreilly.com/catalog/dnsbindckbk/
> >
> >
> >
> --
> 
> Karyn Williams, CNE
> Network Services Manager
> California Institute of the Arts
> karyn at calarts.edu
> http://www.calarts.edu/network