GajimDBus: monitor_dbus.py

#!/usr/bin/python

import gobject, os
import dbus
if getattr(dbus, 'version', (0,0,0)) >= (0,41,0):
    import dbus.glib

OBJ_PATH = '/org/gajim/dbus/RemoteObject'
INTERFACE = 'org.gajim.dbus.RemoteInterface'
SERVICE = 'org.gajim.dbus'

def do_something(details):
    print '%s has %s new emails' %(details[1][0], details[1][1])
    # and do whatever else you want to do
    os.system("getmail") # like fetch mail

bus = dbus.SessionBus()
proxy_obj = bus.get_object(SERVICE, OBJ_PATH)
dbus_iface = dbus.Interface(proxy_obj, INTERFACE)

dbus_iface.connect_to_signal('NewGmail', do_something)

mainloop = gobject.MainLoop()
mainloop.run()