On Thu, 11 Sep 2014, Matus UHLAR - fantomas wrote:

If you point www CNAME @, the 'www' will have both MX and NS records same as
example.com.  Which may e.g. cause rejectd on backup MX hosts, apparently
not designed to receive mail for www.example.com.

Actually no. All other RRs are supposed to be ignored (except for RRSIG, etc) once the CNAME exists. Ie. the MX and NS RRs exist only for example.com, but not www.example.com.

Antonio Querubin
e-mail:  t...@lavanauts.org
xmpp:  antonioqueru...@gmail.com
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