distribute/bad not getting cleaned out
There doesn't seem to be any functionality to clean out distribute/bad, which currently has messages from a very long time ago.
Each spool is specifically described here: http://www.sympa.org/manual/organization
And the specific spool options are detailed here: http://www.sympa.org/manual/conf-parameters/part2#spool_related
The specific clean time periods, and defaults, are on that page, starting with "clean_delay_queue". It seems, based on the other clean options listed here that we are interested in a "clean_delay_distribute", and that default (based on the other defaults that are there) should probably be 7.
(from redmine: created on 2010-02-18, closed on 2014-01-30)