'Remove a mailbox from the subscription list
This command is allowed in the Authenticated and Selected states.
@type name: L{str}
@param name: The mailbox to unsubscribe
@rtype: C{Deferred}
@return: A deferred whose callback is invoked if the unsubscription
is successful and whose errback is invoked otherwise.'

def unsubscribe(self, name):

    return self.sendCommand(Command('UNSUBSCRIBE', _prepareMailboxName(name)))
