CNAME / MX Record question

[Emil Natan]

Using CNAME as MX is not recommended, someone might say forbidden. Check the
following thread:
https://lists.isc.org/pipermail/bind-users/2009-January/074828.html
Technically I think there is no problem to do so, BIND even has an option to
ignore such checks - check-mx-cname.
BTW you did not specify what exactly the problem is, BIND did not load? Your
queries fail? If yes how do they fail?

ena

On Sun, Aug 7, 2011 at 4:05 PM, Scott Hughes <sonicscott9041 at gmail.com>wrote:

> All,
>
> I have Googled and searched the archives for two days and cannot find an
> answer to this question... just more confusion!  Please forgive me ahead of
> time as I run two name servers for my mid-sized company and am by no means
> an expert in using bind DNS. We have about eight domains but don't have a
> lot of records for each zone.  Here is my issue:
>
> We are moving to a two Exchange server / two data center model for
> auto-failover reasons. Both data centers are in to different locations and
> have multiple internet pipes and tier 1 providers coming into their data
> centers.
>
> Here is what I'm trying to do:
>
> For example, our email domain name on the Exchange servers is:
> mail.blahblah.us    Our spam filtering device is: spam.blahblah.us and is
> the MX record.  In the blahblah.us zone file I have A records pointing to
> both correctly.
>
> Our problem comes in on our other domains. I am trying to point
> mail.company1.com to mail.blahblah.us and spam.company1.com to
> spam.blahblah.us using CNAME records.  I'm obviously doing this wrong or
> trying to do something that can't or shouldn't be done.  Like I said, I am
> fairly new to bind9 but I'd sure rather use it than something link MS DNS
> servers!
>
> What I am attempting to do is make it so that if an outside email server or
> inside user goes to mail.company1.com  or  spam.company1.com they are
> 'redirected' to the blahblah.us domain where our UCC cert covers both of
> the Exchange servers.
>
> Please let me know if I've left anything out that would be helpful in
> answering these questions.
>
> Thank you,
>
> Scott
>
>
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