How can I limit the send out per newsletter per customer?

Hi JK, 

You'll want to set up Pressure/Fatigue rules. Here are a couple of resources:

https://experienceleague.adobe.com/en/docs/campaign/automation/campaign-optimization/pressure-rules

https://experienceleague.adobe.com/en/docs/campaign-classic-learn/tutorials/sending-messages/fatigue-management/fatigue-management-using-filters

Regards,

Craig

Hi @jkkkkkkkkkkkkkkkkk ,

You can create a 'Pressure type' typology rule for your case.

Supporting document: Pressure typology rule