I noticed that there a few users (new employees) sent a VERY LARGE file and they never get delivery, but i asked couple of them, they never receive any notification email. I was wondering how long does it take server to send a undeliverable email to the user? Even though, i set it 12 hours, should it be delivery at 12hours and 1 minute?. There are 15 “[email protected]” email to be routed. not like it flood with spam or anything…..