I have been struggling with this all evening, all of a sudden incoming email started to stay in the Active queue and not progress any further. It is showing as being in the smtp-amavis filter.
I have a relayhosts setup so delivery by DNS is disabled.
I re-installed by re-running the install script and selecting upgrade to try and fix the problem but no change.
I have tailed all the /opt/zimbra/log/*.log files and cannot see any errors.
This server is only a week old and has been performing well, so it has worked previously just fine. The server only runs Zimbra and no other system tweaks have been carried out recently.
Thanks in advance.