The local part (i.e. "username") of an email is restricted to a limited set of valid characters. https://www.jochentopf.com/email/chars.html https://www.jochen

The local part (i.e. "username") of an email is restricted to a limited set of valid characters. https://www.jochentopf.com/email/chars.html https://www.jochentopf.com/email/chars.html