every email I have sent since December 2024 (I think) until now has not been DKIM-signed because /var/lib/rspamd (which contains my DKIM keys) did not exist

furthermore, some of them have had X-Spam headers added by my own mail server (or rather rspamd)

this explains why my mail keeps going to spam

(also / on my mail server was world-writable for some reason)

who needs a mail server when you can become the mail server?