[exim] force delivery

Hello, i have 2 servers running exim, one serving local accounts and
the other one running mailman. I have around 3k queued messages, im
trying to force the send of that messages, thats why im running exim
-qff but i only have 1 or 2 delivery procs with the qff running, my
need is to run unlimited delivery process to empty the queue.

Any help?

Thanks all in advance.