OK... I give it a shot...
I rather agree with Phillip:
MX should designate a list of single hosts only, no netmask allowed. --
it is superfluous to the A directive -- I can't think of a good use-case
where you'd want to allow the netblocks of all the MXes to send -- and
even in the few cases that's likely to happen, netblocks aren't all the
same size now. (My ISP has two /25 and two /24 ... allowing mx/24 would
be bad, as it would authorize too much, and mx/25 too little.)
Better instead to say "mx a:subnet1.domain/24 subnet2.domain/25
subnet3....."
and then, for IP6, have an aaaa or a6 type. Problem neatly solved,
clean simple easy to understand, future-proof spec. (I mean, imagine
what happens when IPv8 comes along -- and suddenly you have
mx/24/48/10212 ....)
Ari
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