I had the same prob
checking the status
mailboxd stopped
not running
all other are running ... then i checked the dovecot service ... i don't know how but it had been running ...
then i checked chkconfig there i find enabled...
# /etc/init.d/dovecot stop
# chkconfig dovecot off
if one can not get any solution referring to above plz check the dovecot, sendmail services...
those must be STOP.
