Secure ssl certificate email accounts 

Friendly reminder: if you allow users to register email addresses on your domain, make sure they can’t get:
admin@

administrator@

hostmaster@

postmaster@

webmaster@

(and others from RFC 2142)
otherwise users might be able to get an HTTPS certificate for your domain.

Via https://twitter.com/spazef0rze/status/942800411941048320

manuel11g

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