Email address validation is non trivial: https://www.netmeister.org/blog/email.html https://www.netmeister.org/blog/email.html The only reliable method is to s

Email address validation is non trivial: https://www.netmeister.org/blog/email.html https://www.netmeister.org/blog/email.html The only reliable method is to send an email with a token to the address.