Re: [cobalt-users] MX record question / Raq4i

[Bruce Timberlake <bruce.timberlake@xxxxxxx>]

Jeff Lasman wrote:
> 
> While your second statement IS true, your first isn't.  Because the
> Internet sees "domain.com" as a completely different domain than
> mail.domain.com, each is a "domain" and each needs a primary MX record.
> 
> Because many smtp servers will default to using an A record if there's
> NO MX record for a domain doesn't mean all will, and doesn't mean you
> shouldn't have those MX records.  Each of these MX records will be seen
> as completely independent.
> 
> So yes, you should have the following MX records:
> 
>  domain.com.      IN      MX      30      domain.com.
>  mail.domain.com. IN      MX      30      domain.com.
>  www.domain.com   IN      MX      30      domain.com.
> 
> And while I hate to disagree with someone from Sun/Cobalt, the fact is
> that yes, Bruce, I have written the book on DNS (just haven't gotten it
> published yet, but I'm working on it <smile>).

I defer to Jeff's knowledge of DNS... :)  Just because I work for Sun
doesn't mean I'm always correct, and I'm glad to be corrected so that I
don't continue giving out confusing/wrong info in the future.

I do have my own RaQ set up as I have described, though, and it works
fine for me.  Having multiple MX records probably eliminates confusion,
though, or at least minimizes the gremlin factor...

-- 
Bruce Timberlake
Technology Engineer
Sun Cobalt Server Appliances
Sun Microsystems, Inc.

E: bruce.timberlake@xxxxxxx
U: http://www.sun.com/cobalt/