 |  |
>Sorry if this has been beaten to death on this list already...
Re: MX records and CNames?
From: Jerry Pasker-Systems Admin.
Date: Saturday, March 25, 2000
Time: 10:01:00 pm
>
>Someone over on the SIMS list who usually knows what he's talking about
>just stated that pointing MX records to CNames is a big time no-no, won't
>work, half the net won't understand, is counter to DNS specs, etc etc.
>
>Here's what I was talking about:
>
>> domain1.com MX 10 mail.domain1.com
>> mail.domain1.com C mail.mydomain.com
>
>Now, I've been doing that for a while already, with no known problems.
>This makes it much easier should I ever decide to move the IP of the main
>server (mail.mydomain.com). That's been known to happen.
>
>So am I wrong, or is he?
>
>Thanks
>
>BC
>
>Bill Christensen
>billc@greenbuilder.com
You're wrong... CNAMES in MX records break things quite badly. I've run
into it myself once and after trying to figure out why SOME (two acutally)
mail servers were not being able to send mail to my domain, I traced it to
me placing an MX record that pointed to a CNAME. It worked fine, until I
changed the name of my mailserver, and without thinking about it, made a
CNAME of the old server name point to the new name, without changing the MX
records. At that point the MX records that once pointed at A records,
were then aimed at CNAMES, and things started getting weird.
This was before the days of DNS Expert of course.
And, as usual, Mr Cole is right.
-Jerry
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