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Edit Admin
On the open net, doing sanity checks on user typed material is OK, but should not be blocking, just asking for confirmation.
Fex
A valid email address can be just one letter, with the domain added by the first SMTP server.
Domain length can be as short as three; a.cc .
Few countries have substates, but I have had to receive a few packages over the years with Alabama in the address. AFAIR I have never been to Alabama.
Phone area codes...
Admin
I think you misread the password check - it seems to require at least letters and numbers, but doesn't block other characters. Still not great, but at least not great in a pretty typical way.
Edit Admin
I've seen enough websites that convert email addresses to uppercase as you're typing that it's simply not practical to have a case-sensitive mail server. Theory, meet practice.