Set a max volume constraint

Hey Simone,

You can set communication limits to control the number of emails sent per day & per week at the individual level (see: Enable Communication Limits - Marketo Docs - Product Documentation​), and you can set smart campaign restrictions to limit the number of people that can be run through a campaign (see: Enable Person Restrictions for Smart Campaigns - Marketo Docs - Product Documentation), but AFAIK there's no OOB setting to restrict the number of instance-wide email sends.

Depending on your use case, a combination of communication & smart campaign limits might do the trick.