Add a button to not notify people on a follow-up add

Hello,

I am using the profile of my users to manage who sends what.

For instance, users in "Support" profile can use tasks and follow-ups, with :

• tasks being private (internal) communication
• follow-ups as public information.

But sometimes, users with "Support" profile need to send follow-ups only to customers but there is no added value internally to the post.

That's why I would have like something like this :

Or anything like "Customer only", as you'd like.