Add list-unsubscribe

settings-sample.php

@@ -11,6 +11,7 @@ class Settings
 	const TEXT_ENC = 'UTF-8';
 	const TIMEZONE = 'Europe/Paris';
 	const MAIL_SERVER = '';
+	const MAIL_FROM = '';
 	const MAIL_USER = '';
 	const MAIL_PASS = '';
 	const DEBUG = true;