_Email Address
This Property represents an email address.
_Email Address is, quite intentionally, marked System Hidden. That is, values of
_Email Address are scrubbed out before end users get to see them; this is
important for privacy.
You should not try to use this property yourself. We might add a user-visible Email Address Type
sometime later, but you should never use this internal one.
This Probably will probably be eliminated entirely in the medium term.
