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 202.108.3.242
And,
mail.china.com. 391 IN CNAME mail.china.com.cachecn.com.
mail.china.com.cachecn.com. 191 IN MX 10
mx-mail-china-com.icoremail.net.
Thanks.
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