I raise this question because of the Wosign's incident about high port 
validating. Many CA use email validating such as send a email to 
[email protected], or put a specific file into the root of website.
What I think is that this cannot validate *domain* is yours.  It just verified 
you have the mail server or you control the host. The best way to prove you own 
a domain is to change the DNS records of the domain.
So I suggest to change domain validating method to verify DNS records. Is that 
feel better?
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