def get_email_domain_from_username(username):
    """
    A quick utility for getting an Email Domain from a username
    (the last part of the email after the '@' sign)
    :param username: String
    :return: String username
    """
    split_username = username.split('@')
    if len(split_username) < 2:
        # Not a real email address with an expected email domain.
        return None
    # we take the last split because `@` is technically an allowed character if
    # inside a quoted string.
    # See https://en.wikipedia.org/wiki/Email_address#Local-part
    return split_username[-1]

@@ -208,23 +208,62 @@
 rn: 
-String user
+Domain name string. %60None%60 if there is no domain 
 name
+.
 %0A   

update docstring