Database corruption

It seems like almost once a week I need to remove the old databases to
start fresh again. The program "exim_tidydb" generates a segfault when
trying to access the database, and all queue mail is forever stuck.

Having a database that corrupts once a week sort of defeats the purpose
of having a database. Is there any preventive maintenance I can do to stop
this from happening? Am I completely screwed once it does happen? Can
anything be done to the exim code to make sure that the database is good
before proceeding?

It is rather unsettling that exim continues running as normal, happily
chucking things into never-never-land (the corrupted queue). I would
rather it shut down completely when the queue is not valid.