1) logwatch fails to run as `--mailfrom` is not a valid flag for logwatch command on debian 9 2) logwatch fails to deliver mail due to message being too long, here is the fix: https://blog.dhampir.no/content/exim4-line-length-in-debian-stretch-mail-delivery-failed-returning-message-to-sender
--mailfromis not a valid flag for logwatch command on debian 9https://blog.dhampir.no/content/exim4-line-length-in-debian-stretch-mail-delivery-failed-returning-message-to-sender