Sentry limit notifications to certain users
I found it - found even two different ways:

I can make projects public (under project settings) so everyone (with a sentry account) can access it.
I can give a users access to a project and that user has to opt-out of emails by going to his Account (top right) and then notifications.
Can I give a user access to a sentry project but not send him all the emails?
Sometimes I want to forward the error message to our mobile developers, so they can see the parameters, but they don't need to get all the other reports.