A couple of days ago, my email server crashed and it could not be restarted. The reason was unknown. I had no other method to restore it but had to perform a remote reboot. Hopefully everything worked fine.
Actually, I had not rebooted my server for over 200 days. When running programs are closed, there is no guarantee that residual memory occupied could be 100 % released. Days after days, there is less and less usable memory. It is a good idea to reboot server after a certain time, say one or two months.
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