[MM3-users] Throttle outgoing emails to a certain rate?

Is there a possibility to throttle the sending of outgoing emails to a certain rate, e.g. 100 emails per hour, or to split them up into corresponding chunks? I run Mailman 2.1.33 on a hosted server and the provider only allows me to send a maximum of 100 emails per hour. The excess emails are also simply discarded and the sender and list administrator get a bunch of error emails. This is very annoying, especially because I didn't know about it and the problem only now occurs occasionally during operation... ;-( Thanks for all hints.