Done

As someone who has been 'done' with a few people in life, here's a few tips.

When you're done with someone you:
Don't email them
Don't mention them
Don't send them things
Don't refer to them
Don't call them
Don't talk to them
Don't take potshots at them
Don't respond to them when they speak to you

'Done' means you have nothing to do with them in any way, shape, or fashion. You don't have to tell people you're done with them. They'll figure it out when you don't speak to them for the next 20 years. Or they won't. Either way you don't care cause you are done.