Planner - Plan 1 - Welcome message

Hi,

we're using Teams for managing our projects. We have Team "Projects" and there are many channels inside this Team. Each channel represent our project (we are HVAC company). With the basic Planner, I used to create channel "Mr. Newman" - inside that channel we have all files related to that project, we have discussions about that project and we also have Planner assigned to that project. Which works well.

Since we are growing, I wanted to test the Planner Plan 1 (I like the Goals, timelines etc), however, there is a huge problem that when I create the Planner now (the premium one), it sends an E-mail to everyone. I don't want that. All of the employees are getting emails that they have been added to the planner "Mr. Newman" etc. and they are asking what should they do with that? 

How do I turn that off?

Thanks,

Jakub