>There's not really something wrong with MX's pointing to CNAME's. It's just that some mailservers could (can?) not handle this. So if you want to be able to receive mail from all kinds of mailservers, don't use CNAME's for MX's.
No. It breaks a basic assumption set in stone in RFC821. It has
nothing to do with mailer software.
Regards
Henning
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