[Exim] lockfile won't disappear

I have 5 machines all running on FreeBSD 4.1, with exim v3.20 and
using BerkeleyDB 3.1.14.

They all have lockfiles (wait-remote_smtp.lockfile, retry.lockfile &
reject.lockfile) hanging around indefineately.

I have not set "lockfile_timeout", because the default (30m) should be
adequate.

The lockfiles however are days -- even weeks old.

Any ideas?
--
Jim Pazarena    mailto:paz@qcislands.net
                http://www.qcislands.net/paz