Just wake up from sleep, check emails but the mail server not responding. I wonder why.. so try to SSH to check the MTA status, but I even can’t SSH My server. Check easymonitor.com, it report that My server already down for 2 hours.
Ok, contact the datacenter. Hmm.. impressive the datacenter response very fast! less than 10 minutes They reply back My email and rebooted My server :D now My server is accessible again :p