PS - Maybe someone can teach you mail 101. It's never a good idea to have a CNAME to be the MX.
confuciun.com. 497 IN MX 10 mail.confuciun.com. mail.confuciun.com. 600 IN CNAME confuciun.com.
Though the answer is supposedly in "mail 101" or maybe DNS 101, I've been unable find a decent reason for your statement? I hope you don't mind the dumb question of "why?"
because it says so in the RFCs. http://www.faqs.org/rfcs/rfc1912.html http://www.faqs.org/rfcs/rfc974.html http://www.faqs.org/rfcs/rfc1034.html
excerpt from rfc1912: " strongly discouraged:
podunk.xx. IN MX mailhost
mailhost IN CNAME mary
mary IN A 1.2.3.4[RFC 1034] in section 3.6.2 says this should not be done, and [RFC
974] explicitly states that MX records shall not point to an alias
defined by a CNAME. "
-The above given example is even worse since any e-mail going to the domain confuciun.com is supposed to go to mail.confuciun.com which is an alias for confuciun.com which hmmm..... CONFUSING!
