[Exim] Mandrake msec and exim

Has anyone got any experience of running exim 4 under Mandrake? I have
hacked together a set of RPMS by msec (I presume) keeps reseting the
permissions so that the binaries are no longer SUID root (in fact they
become GUID mail).

Can someone give me a clue as to what I have to change to prevent this
from occuring (about once an hour). Changing msec to 1 (instead of the
default of 2) has no effect.
--
Dirk Koopman <djk@???>