CNAME / MX Record question

Emil Natan shlyoko at
Sun Aug 7 15:04:46 UTC 2011

Using CNAME as MX is not recommended, someone might say forbidden. Check the
following thread:
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?


On Sun, Aug 7, 2011 at 4:05 PM, Scott Hughes <sonicscott9041 at>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:
>    Our spam filtering device is: and is
> the MX record.  In the zone file I have A records pointing to
> both correctly.
> Our problem comes in on our other domains. I am trying to point
> to and to
> 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  or they are
> 'redirected' to the 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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