Version 12.0.18. Using QMail.
If I attempt to remove even a small message from the mail queue, using the panel interface, the screen grays slightly but nothing happens. If I refresh the screen after several minutes, I'll sometimes get the following message:
"This operation is taking too long. Check the results in a few minutes."
Switching to Postfix eliminated the problem. But with Postfix, all of my Mailman lists (scores of them) broke, so I had to switch back -- and the problem reappeared.
If I attempt to remove even a small message from the mail queue, using the panel interface, the screen grays slightly but nothing happens. If I refresh the screen after several minutes, I'll sometimes get the following message:
"This operation is taking too long. Check the results in a few minutes."
Switching to Postfix eliminated the problem. But with Postfix, all of my Mailman lists (scores of them) broke, so I had to switch back -- and the problem reappeared.