def validate_email(self, email):
        """
        Validate the provided email address.

        Args:
            email:
                The email address to validate.

        Returns:
            The provided email address, transformed to match the RFC
            spec. Namely, the domain portion of the email must be
            lowercase.
        """
        user, domain = email.rsplit("@", 1)

        return "@".join([user, domain.lower()])
def validate_email(self, email):
        """
        Validate the provided email address.

        Args:
            email:
                The email address to validate.

        Returns:
            The provided email address, transformed to match the RFC
            spec. Namely, the domain portion of the email must be
            lowercase.
        """
        user, domain = email.rsplit("@", 1)

        return "@".join([user, domain.lower()])
def validate_email ( self , email ) : user , domain = email . rsplit ( "@" , 1 ) return "@" . join ( [ user , domain . lower ( ) ] )
Validate the provided email address.

        Args:
            email:
                The email address to validate.

        Returns:
            The provided email address, transformed to match the RFC
            spec. Namely, the domain portion of the email must be
            lowercase.
Validate the provided email address .