I have just migrated from a mailman 3.2.2 Debian package installation to a mailman 3.3.8 source install (in a Python virtual environment as mailman user) on an Ubuntu 20.04.6 LTS system.
Several months ago, the system had been upgraded from mailman V2 to mailman V3.2.2. The server has been active for over 20 years.
I've just taken on the project so I'm new to all of this, and one thing I noticed that caught my eye, and has left me curious, is that for the first a couple of seconds starting just after midnight every night (just after log rotation) mailman.log would have many (dozens, or hundreds) of lines entered in it just like this one:
Jun 19 00:00:04 2023 (2266) 127.0.0.1 - - "GET /3.0/users/old-user@domain.tld HTTP/1.1" 404 58
where "old-user@domain.tld" is the email address of a user who either had unsubscribed or changed their email address (I don't know which, I just know they are no longer a member/subscriber to the list). Each successive entry in the log would have a different "old username" in it. I don't understand why these entries would be in the log and what they mean. Can someone shed some light on this for me? This is merely a question of curiosity, and not one of import. (Since migrating from 3.2.2 to 3.3.8 this behavior has stopped, be that GOOD or BAD.)
Ken