The e-mail address @ does not appear to be valid.

The e-mail address . does not appear to be valid.

The e-mail address .@ does not appear to be valid.

The e-mail address mary.smith.mail.php.example does not appear to be valid.

The e-mail address alan.smithee@test does not appear to be valid.

The e-mail address jsmith456@test does not appear to be valid.

The e-mail address mjones@example does not appear to be valid.

The e-mail address john.smith@php.test is valid

The e-mail address john.jones@php.invalid is valid

The e-mail address jsmith456@example.com is valid

The e-mail address mjones@example.net is valid

The e-mail address jane.a.doe@example.org is valid