It still works if MX record to CNAME but it needs extra processing time 
and violate RFC rules.

You can use this link the check your DNS entries http://www.dnsreport.com/

Cheers
Raylund

sylikc wrote:

>Richard / Jeffrey,
>
>
>On Mar 24, 2005 10:52 AM, Jeffrey Goldberg <jeffrey at goldmark dot org> wrote:
>  
>
>>On Mar 24, 2005, at 2:30 AM, Richard Parvass wrote:
>>
>>    
>>
>>>FYI, CNAMEs are prohibited in MX records, according to RFC1912 2.4,
>>>and RFC2181 10.3.
>>>      
>>>
>>Indeed.
>>    
>>
>
>That's kinda odd and good to know.  I don't run my own DNS, but use a
>3rd party provider for my DNS, and oddly enough I use a CNAME in the
>data field of my MX record and things work out... but I guess it's at
>least nice to know it's not supposed to work in case it breaks in the
>future.
>
>
>/sylikc
>
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