There used to be a button or something for e-mailing another member, but I can’t find it. And I’ve received e-mails from other members recently, so I’m pretty sure the function is still available. But how does it work?
Also, is it possible for me to e-mail a former member, departed member, or banned member?
Click on his/her username at the top left of a post, and a dropdown menu will appear. Among the options presented is one to Email This Member. Click that, and you’ll be taken to a page displaying the member’s email address, or a message that “This member has chosen not display an email address” or soemthing to that effect.
As long as you can find a post by a former, departed or banned member (the Search using the username is handy here), and the account information is still intact, you’ll be able to email them, provided the email address is still active, of course.
As far as a departed member, only James Van Praagh or John Edward (no, the other one) can do that. 
Houdini’s ghost has been trying to contact us for years.