I had a mailbox that was hitting ratelimit “to” continuously, although it was not actually getting any new mail in.
It got a few spams in a bunch, nothing like the 100/1s the limit is supposed to be, but then got rate limited “to” and stayed in this state for ~ 12 hours, rejecting all lincoming emails.
Restarting the rspamd container had no effect.
I enevtually changed the rate limit in the ratelimit.conf file to reduce the to rate to 200/1m , and this fixed it.
Perhaps it was just the container rebuild that fixed it, don’t know.
Just a heads-up in case this is a new rspamd bug turning up.