Another thing I desperately try to find out is why my /var/db/spamd files grows to more than 1 GB within a week.
Just for fun, check your file size of /var/db/spamd on your OpenBSD machine. Maybe you'll be surprised too.
When I mv /var/db/spamd to somewhere else and restart spamd, it starts with a 200k file. When a mail comes in, it is 524k. After a couple of hours, it's 3 megabytes. After a month, my /var is full.
Another box running OpenBSD 5.0/i386-RELEASE is up for almost a year, has a spamd file of just 300kb. That seems normal.
Does anyone have an idea where this phenomenon comes from?