Hi Werner:
Try to stop qmail-send process.
It will show you in the log a line in every delivery exiting ASAP, and
every incoming message will be delivered when you restart qmail-send
process.
If you execute qmail-qstat you will see messages in queue but not yet
preprocessed growing for every
two solutions
1. Don't start qmail-send in your RC script (in case u are not
using supervise (comment out the line having qmail-start).
If qmail-send is already running
kill pid of qmail-send
If using supervise,
touch /service/qmail-send/down
svc -d
