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nameserver - CNAME domain to another domain, but keep different SPF records for the two?

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SCENARIO:





  • mydomain.com
    is the main website, we do send/receive mail using
    address@mydomain.com.
    mydomain.com DNS has got an SPF record "v=spf1 a mx
    ~all"


  • mydomain.net
    is just an alias for mydomain.com, but we do NOT send mail
    using
    address@mydomain.net. Therefor mydomain.net DNS has got an SPF
    record
    "v=spf1 -all" to acknowledge everyone it does
    not send
    mail




Since
mydomain.net is an alias for mydomain.com I wanted to use CNAME in DNS,
thus:



mydomain.net -> CNAME
            -> mydomain.com

www.mydomain.net -> CNAME ->
            mydomain.com


But by
doing this I noticed that when testing SPF for mydomain.net href="http://www.kitterman.com/spf/validate.html" rel="nofollow noreferrer">with a
DNS tool like this the SPF returned is the one in mydomain.com
"v=spf1 a mx ~all" and NOT as I would expect the
"v=spf1 -all"



Is there
a way to use different SPF for the two domains, by still using
CNAME



Answer




A CNAME means that the hostname is exactly
the same as the target hostname with respect to all record
types. If this is not what you want then you can't use a
CNAME.



You also shouldn't CNAME the root of a
domain (i.e. mydomain.net), because this means that the SOA for mydomain.net is actually
that of mydomain.com.



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