Controlling the sending rate to Kannel

[Peter]

Dear all,
Is there a way to control the rate of sending to kannel via http???
I can see that if you flood the input there are cases that kannel does
not respond to send requests although they were send. This transaction
also (as expected) does not have dlr. Is there a way to get feedback
from kannel about the loading is handling at that particular moment?
ie. the ack response to include loading info.
Best regards,
Dr. Peter Kontopoulos