Send email from adhoc cards

We are creating the ability for users to send emails from an adhoc card.
This makes me slightly nervous. This is invoked from two separate controls. If, for some reason, the state of this property flips somehow, the controls will do the opposite of what they're intended to do. The previous code (explicitly setting the property to `true` and `false`) didn't have this issue.

I don't think it's critical to change this, but wanted to throw this out there.