question about CNAME and MX
Matus UHLAR - fantomas
uhlar at fantomas.sk
Fri Mar 19 08:30:43 UTC 2004
> 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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