On Feb 10, 2022, at 18:55, Alex <mysqlstudent@gmail.com> wrote:

There used to be a timer similar to something like
amavis-quarantine-clean.timer that periodically would remove old files
from /var/spool/amavisd/quarantine, but it's nowhere on the system on
fedora35, yet the system is somehow deleting files older than 30 days
from the quarantine still.

Where do I look? It's also not an obvious other timer

I suggest you look at:

/usr/lib/tmpfiles.d/amavisd.conf

And “man systemd-tmpfiles”. 
--
Jonathan Billings