Postqm
Download
Tarballs:
Git repository
Postqm is hosted on Lysators Gitlab where you can browse the source et cetera. Or you can install Git and run the command below to get the Postqm sources directly:
git clone https://git.lysator.liu.se/postqm/postqm.git
What?
Postqm finds, reports on and processes entries in the Postfix mail queue.