June 21, 2026
9:19 p.m.
Hi,
I did the virtualenv installation on Debian trixie.
I got mailmanweb running, created a superuser, could login into https://my.site.net/admin (after resolving CSRF errors).
I created a new site (my.site.net) in Django, deleted example.com and changed SITE_ID to 0 in /etc/mailman3/settings.py .
After restarting mailman3 and mailmanweb services I get Server error,An error occurred while processing your request. when I call https://my.site.net/admin again.
Even if I change SITE_ID back to 1 there is no change.
What have I done wrong? I haven't found any solution on the internet. And, even more important, how get I get it working again?
Thank you for your help.
Flo.