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check process postfix with pidfile /var/spool/postfix/pid/master.pid
GROUP mail
start program = "/etc/init.d/postfix start"
stop program = "/etc/init.d/postfix stop"
if cpu > 60% for 2 cycles then alert
if cpu > 80% for 5 cycles then restart
if totalmem > 200.0 MB for 5 cycles then restart
if children > 250 then restart
if loadavg(5min) greater than 2 for 8 cycles then stop
if failed host localhost port 25 type tcp protocol smtp
with timeout 15 seconds then alert
if 3 restarts within 5 cycles then timeout
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