Your answer didn't help.
Yes I speack about uddeim Premium Plugin :
www.slabihoud.de/software/id4003.htm
With This plugin and uddeim component we can set more restriction access (see screenshot).
The problem is not here. The problem is to have a "false" button "send a message" always visible, even for people who can't send messages.
Like a call action to encourage people to sign up.
Actually :
- when you can send message = button is visible
- when you can't send message = button is invisible