validemail extended from validate_email to use dnspython by Oleg Borodai <oleg@borodai.com> in April 2018
froked from validate_email, created by Syrus Akbary <me@syrusakbary.com> in
April 2012.
This package is based on the work of Noel Bush <noel@platformer.org>
https://github.com/noelbush/py_email_validation