'Send a PASS command to perform the second half of plaintext login.
Unless this is absolutely required, use the L{login} method instead.
@type password: L{bytes}
@param password: The plaintext password with which to authenticate.
@rtype: L{Deferred <defer.Deferred>} which successfully fires with
L{bytes} or fails with L{ServerErrorResponse}
@return: A deferred which fires when the server response is received.
On an OK response, the deferred succeeds with the server
response minus the status indicator.  On an ERR response, the
deferred fails with a server error response failure.'

def password(self, password):

    return self.sendShort('PASS', password)
