To: Player X (outgoing) and Player Z (incoming)
  From: Moderator
  
Calling [ Player X, email@address ] and [ Player Z, email@address ] - 

[ Player X ], we regret to inform you that you are out of game [ game ]
If you can write back, let me know your situation and I'll do what
I can to help out.  

[ Player Z ], you are now replacing [ Player X ] as Side [ side ] in [ game ].
Further instructions will follow in another message!

-- The Moderator