Allows users to submit rfc822 formatted email addresses

[mbernier]

Issue Summary

Similar to: sendgrid/sendgrid-python#348

Where the user can submit email addresses as:
example@example.com
or
example example <example@example.com>

[gr8shivam]

Can we use PHP mailparse?

[ssiddhantsharma]

## We can use {rfc822.php} to validate email, it is a good workaround and works fine on my system.
(Credits to original author @iamcal)

https://github.com/iamcal/rfc822/blob/master/rfc822.php

require_once "ref822.php" if(is_valid_email_address("email..")){ //valid }

[childish-sambino]

#979 is in the backlog for review. We're (slowly) working through open PRs. Note that PRs where tests are passing are prioritized first.

[thinkingserious]

Since there has been no activity on this issue since March 1, 2020, we are closing this issue. Please feel free to reopen or create a new issue if you still require assistance. Thank you!