check process exim 
	with pidfile /var/run/exim4/exim.pid
	group mail
	depends on clamav, spamd
	start program = "/etc/init.d/exim4 start"
	stop program = "/etc/init.d/exim4 stop"
	if failed host 127.0.0.1 port 25 protocol smtp then alert
	if 5 restarts within 5 cycles then timeout