[dns-operations] MX CNAMEs

风河 news at windwrite.com
Fri Dec 26 06:17:49 UTC 2014

I was thinking MX should not be a CNAME record.
But these two are broken the rules, and they seem work just fine?

2008.sina.com.        52    IN    MX    10 mx.2008.sina.com.

mx.2008.sina.com.    8    IN    CNAME    freemx1.sinamail.sina.com.cn.
freemx1.sinamail.sina.com.cn. 8    IN    A


mail.china.com.        391    IN    CNAME    mail.china.com.cachecn.com.
mail.china.com.cachecn.com. 191    IN    MX    10 


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