email should not be case sensitive

[rubo77]

If you change case in your email it is treated as another monitor email.

This should be changed so there is only one monitor, no matter the car

[RalfJung]

The part of the email before the @ is actually, in general, case sensitive. (It depends on the mail server.)
Only the part after the @ is case-insensitive.

See https://tools.ietf.org/html/rfc5321#section-2.4:

The local-part of a mailbox MUST BE treated as case sensitive.

[rubo77]

I dont know any use case of using mails with different case if you are not the same person, so we should implement this, since I guess 99% of all mail servers also are set to case-insensitive