爲何域名解析中CNAME記錄和MX記錄不能共存

技術剖析 RFC 1034( http://tools.ietf.org/pdf/rfc1034)章節3.6.2中指出: If aCNAME RR is present at a node, no other data should be present; this ensuresthat the data for a canonical name and its aliases cannot b
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