Looks like something burped on my mailserver and my bogofilter wordlist got too big. Probably something to do with limits anyhow. In any case I was looking for a way to recover from the issue and came across this pearl in the Bogofilter FAQ. Well, the advice is incomplete. If you really hose up the database then bogoutil -d will stop printing entries before the end of the database. The next recovery step is to use the db utilities: db_dump and db_load to fix the database. db_dump -r (on FreeBSD db_dump-<version>) dumps the database into a text file and db_load creates a text file from a word list. The problem is that the advice in the bogofilter faq is out of date. It looks like there are some parameters that have to be specified. My solution: use db_dump without the -r that creates a broken database with a default header. Copy the header into the new text file and then append the output of db_dump -r to that. Et voila!