https://docs.mailman3.org/en/latest/migration.html We currently run Mailman 2 which is not supported in Debian/Bullseye which will freeze soon. So upgrading will force an upgrade to Mailman 3 (which is a good thing anyway), above are the upgrade docs. One thing to note is that URLs for archives will change, is this a problem? https://etbe.coker.com.au/2021/01/12/psi-cgroup2/ I've already started upgrading the LUV server to Debian/Bullseye, the above blog post shows one of the things I'm doing to take advantage of new Linux and systemd features. To get some of these things working well before the freeze of Bullseye I need to have some real servers running the latest code. I would like to get the upgrade done in the next few days. I don't anticipate this causing any inconvenience as the lists have been very quiet recently. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/