Okay, I *think* I killed the processes. When I run
ps -fwwA|egrep 'master|runner'
I just get
root 7595 1 0 Jul26 ? 00:00:04 /usr/lib/postfix/sbin/master -w mailer 21851 21001 0 22:45 pts/1 00:00:00 grep -E --color=auto master|runner
As far as the permissions, you asked does your systemd script set the user to the Mailman user? I don't know how to check that, but I saw many files in /var/lib/mailman3 were owned by a user named list. Last time I tried to run mailman status, it threw a permission error on mailman.cfg, which was owned by root. I changed owner to list, and it produced a different error. So I'm guessing we are on the right path? There was no mention of a user named mailman in the system before, but maybe I need to check something.
Lastly, I deleted everything in /var/lib/mailman3/locks.
However, running mailman status now throws this permission error
File "/usr/bin/mailman", line 11, in <module> load_entry_point('mailman==3.1.1', 'console_scripts', 'mailman')() File "/usr/lib/python3/dist-packages/mailman/bin/mailman.py", line 94, in main initialize(config_path) File "/usr/lib/python3/dist-packages/mailman/core/initialize.py", line 188, in initialize initialize_1(config_path) File "/usr/lib/python3/dist-packages/mailman/core/initialize.py", line 123, in initialize_1 mailman.config.config.load(config_path) File "/usr/lib/python3/dist-packages/mailman/config/config.py", line 107, in load self.push(filename, user_config.read()) File "/usr/lib/python3/dist-packages/mailman/config/config.py", line 113, in push self._post_process() File "/usr/lib/python3/dist-packages/mailman/config/config.py", line 125, in _post_process self.ensure_directories_exist() File "/usr/lib/python3/dist-packages/mailman/config/config.py", line 227, in ensure_directories_exist with Lock(lock_file): File "/usr/lib/python3/dist-packages/flufl/lock/_lockfile.py", line 334, in __enter__ self.lock() File "/usr/lib/python3/dist-packages/flufl/lock/_lockfile.py", line 203, in lock self._write() File "/usr/lib/python3/dist-packages/flufl/lock/_lockfile.py", line 417, in _write with open(self._claimfile, 'w') as fp: PermissionError: [Errno 13] Permission denied: '/var/lib/mailman3/locks/mailman-cfg.lck|[redacted server name]|21787|3720843219351355903'
That file was removed when you told me to clear the locks folder (I save a copy, however). So I'm stuck again. Sorry for all the questions and thanks very much for the help.