I self host my email since 20+ years. Always done with the postfix + dovecot stack with the works (dkim dmark DNS stuff etc).
In the last few years I just removed all spam filters as they where a chore and didn’t provide no much benefit (3-5 spam emails per week) even if my main email address has been out and about for at least 2 decades or more.
Recently, last few weeks, spam is picking up to the point I receive some 10+ spam emails per day and this is pretty annoying, obviously.
So, what are you doing for spam filtering at server level nowadays? Is it still spamassassin circus? Anything better or more efficient?
Most effective method for me has been to use 1 e-mail address alias per service. If that address starts receiving spam then you know who is to blame for the leak, can move that service to a new e-mail address and then blackhole all e-mails sent to the old address. That obviously means having to setup a new address for every service though so I usually setup 20 at a time and hand them out as needed.
That seems overkill, in fact my 20y old only address still works pretty fine, and with rspamd setup, with basic settings, the annoying few emails have been intercepted now.
But indeed an extreme but effective approach, yours.