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It is not valid for a record to have both a CNAME and any other entires.
Eg,
@ CNAME
www.something.com.
@ MX 10 server.somewhere.com.
is not allowed. That doesnt mean people dont do it, but its against the
relevant DNS RFC's and will cause problems like you have described.
The thing to do is inform your customer that their website is
"
www.customer.com", and not "customer.com", becuase website hostnames
have to have an actual host name and not just a domain. If their ad
people put "customer.com" in their billboards/etc, then that is a
mistake on the ad people.
Just like if your phone number is 888-123-4567, and your ad folk list
123-4567, then they made a mistake.
On Thu, 29 Mar 2001, Sascha E. Pollok wrote:
> Dear folks,
>
> this might have been discussed before and is somewhat related
> to DNS and not to EXIM but imagine a customer has a zone-file
> like this:
>
> @ IN MX mail.customer.com.
> IN MX 2nd-mail.isp.com.
>
> www IN A 192.168.1.1
> mail IN A 192.168.1.2
>
> And the customer want's his web-site to be accessible through
>
> http://customer.com additionally, we could put a CNAME in
> the zone file or:
>
> IN A 192.168.1.1
>
> What we get then is, that some MTAs try to send SMTP-mail
> to that host instead of looking up the MX-records. Is there
> any chance to circumvent this?
>
> Regards,
> Sascha
>
> ---
> Sascha E. Pollok
> Internet Port Hamburg
> Technical Manager / Network Operations
> Grosse Reichenstrasse 27
> D-20457 Hamburg
> Germany
> Tel.?? +49 (0)40 37 49 19-0
> Fax??? +49 (0)40 37 49 19-29
> Email: sp@???
> ICQ #38955239
> You spamma my mailbox I nukea da ass
>
>
> --
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>
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