MX pointing to CNAME

[Peter Dambier]

Tom Del Rosso wrote:
> Who's right?  The ISP says MX records must point to a canonical name, but
> dnsreport.com says "CNAMEs are prohibited in MX records".
> 
> Why is is that, while this ISP already has the MX for one of my domains
> pointing to another domain, the dnsreport.com report says "There appear to
> be no CNAMEs returned for A records lookups from your MX records".
> 
> For another of my domains that is hosted by Earthlink, the MX is also
> pointed at another domain, but in that case the dnsreport.com report says
> "One or more of your MX records points to a CNAME" and dnsreport considers
> that a 'fail' error.
> 
> 

What I have seen is CNAMEs in the local domain mostly work while CNAMEs to
another domain mostly bite. The rest mostly depends on the resolver and the
mailer trying to use that MX record.

If you ask the inventors of CNAME they will tell you CNAME was not a good
idea after all. If you can, avoid them. They will at best cost time to look
up.

Cheers
Peter and Karin


-- 
Peter and Karin Dambier
Cesidian Root - Radice Cesidiana
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mail: peter at peter-dambier.de
mail: peter at echnaton.serveftp.com
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https://sourceforge.net/projects/iason/