private static function _get_domain_from_address( $p_email ) {
		$t_domain_pos = strpos( $p_email, '@' );

		// If no @ sign, assume domain was passed in and return as is.
		if ( $t_domain_pos === false ) {
			return $p_email;
		}

		return strtolower( substr( $p_email, $t_domain_pos + 1 ) );
	}