afaik, @twisted1919 said a while ago that all isuues re pcntl are resolved
(pcntl does enable parallel send processes, and hence 'more' can be sent quicker, but there were problems of 'to much sending' in the past, but they are supposed to be solved...however, do you use an old version?)
many have asked re the 'hourly quota' settings to be re-designed/worded, as there have been many misunderstandings...so perhaps a few users could suggest a better way!
I use the latest version, updated just a few days ago.
Could you explain it to me then? I'm not understanding how I should limit the sending of my emails if they aren't being limited by setting the delivery server limit.