question about CNAME and MX

[Matus UHLAR - fantomas]

> Brian Bergin <see_footer at bottom.com.no_domain> wrote:
>> If I have 2 domains, comcept.net, comceptsolutions.com, why can't I do this:
>> 
>> Domain1: comcept.net
>> 
>> @                       A     66.77.187.2
>> @                       MX    10      mx1.comcept.net.
>> www                   CNAME   comcept.net.
>> 
>> 
>> Domain2: comceptsolutions.com
>> @                       CNAME comcept.net
>> @                       MX    10      mx1.comcept.net.
>> www                   CNAME   comcept.net.
>> 
>> Basically, I want comceptsolutions.com to alias anything I change in
>> comcept.net.  Am I missing something?

Barry Margolin <barmar at alum.mit.edu> wrote:
> BTW, why did you even think that the second domain needs an MX record of 
> its own?  It's the same as the MX record for the target of the CNAME, so 
> it would automatically get it from there anyway.  Are you under the 
> impression that CNAME records are only followed when looking up A 
> records, and not for other records?  That's not how it works -- the name 
> is an alias for *all* types of lookups.

The problem can be, that any @comceptsolutions.com destination address
@would be rewritten by sender MTA's (if they follow the RFC) to
@comcept.net, if he used "comceptsolutions.com. CNAME comcept.net.

So, if he wants to avoid such rewrites (already on sender sites), he will
just have to avoid CNAME and define both A and MX.

-- 
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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