mailer-daemon

First of all hello everybody. As I was checking queue inside of my proxmox mail gateway, I have seen that I have like 30 mails which are just hanging there. All mails are from MAILER-DAEMON@my-domain.com to system@webuntis.com. Reason is "connect to hermes.webuntis.com [213.208.138.150]:25...

Hi there, is there any way to change the message delivery failure message that gets emailed out to the user, when a email can not be delivered (wrong/non-existed destination address). At the moment, user gets the following: SUBJECT: Delayed Mail (still being retried) This is the mail system at...