Allow +-sign in e-mail local part.
Allow +-sign in e-mail local part.

Used by many mail providers to provide automatic aliases.

agdsn/pycroft,agdsn/pycroft,agdsn/pycroft,lukasjuhrich/pycroft,agdsn/pycroft,lukasjuhrich/pycroft,agdsn/pycroft,lukasjuhrich/pycroft,lukasjuhrich/pycroft