Fires when user disconnects from server.

Private Sub object_Disconnected(User)

The Disconnected Event syntax has these parts:

This event is fired after user issues 'QUIT' command and is about to leave server.

At this time, you should not try to examine contents of messages or any information about user. Although you'll find them in User parameter - you should have done it already before in UpdateMailbox event. This event is strictly informational.