Send a thank you to a general authority

Is there an official way of sending an email to a General Authority? A talk during this last October conference really helped me out personally and I would like to say thank you.

I know they get frequently get letters and responses because they're mentioned during conference but I've never pursued it until now.

Thanks!

I too would appreciate knowing how to contact specific general authorities. Many will often say they received letters, but I wouldn't know where to send one.

Thanks.