I have a quite big site with more than 7100 subscribers. I had contacted my hosting company and they changed “Max emails per hour” to 25000.
But Delivery engine still is sending only 284 mails per 5 minute, so sending newsletter to all subscribers tooks me about 125 minutes.
With “Max emails per hour” = 25000 it should be less than 20 minutes.
What should I change if I want to use “full power” of my server?
Check on diagnostic panel the max execution time of PHP. Id it is too low, newsletter will suspend the delivery to avoid to have the PHP process killed.
Is so, ask the system administrator to rise up the value (for example to 180 seconds).