@tim - Mailwizz has a special integration for MailerQ, it has a special delivery server type you can choose when adding a new delivery server.
Also it has a command line daemon to process the bounces that come from mailerq, that is:
This doesn't matter. The daemon uses the same connection as the delivery server, so it should work just fine.
Look into your mailerq and see if the results queue is populated and if there are connections to it.