Running your own non-bouncing Zimbra server

Despite having configured SPF, DKIM and DMARC for my email domain, I recently noticed that the mail queue of my Zimbra server was going through the roof with thousands of undelivered and postponed email messages, mostly with sender “mailer-daemon” and some recipient I did not know. If you run a Zimbra server and have this problem or perhaps even better; if you don’t have it yet and don’t want to have it, read on.

Read more…