Notification is failing

[ashish]

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 387, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 237, in dispatch
    resp = chosen_handler.process_request(req)
  File "build/bdist.linux-i686/egg/tracdiscussion/core.py", line 72, in process_request
  File "build/bdist.linux-i686/egg/tracdiscussion/api.py", line 33, in render_discussion
  File "build/bdist.linux-i686/egg/tracdiscussion/api.py", line 503, in _do_action
  File "build/bdist.linux-i686/egg/tracdiscussion/notification.py", line 91, in notify
  File "/usr/lib/python2.4/site-packages/trac/notification.py", line 216, in notify
    Notify.notify(self, resid)
  File "/usr/lib/python2.4/site-packages/trac/notification.py", line 114, in notify
    self.begin_send()
  File "/usr/lib/python2.4/site-packages/trac/notification.py", line 287, in begin_send
    self.server.login(self.user_name, self.password)
  File "/usr/lib/python2.4/smtplib.py", line 587, in login
    raise SMTPAuthenticationError(code, resp)
SMTPAuthenticationError: (535, 'authentication failed (#5.7.1)')