FortiMail logging had stopped functioning for nearly a month and start working good after reboot

Hi Team,

I’m currently diagnosing an issue I encountered with our FortiMail system. The logging service unexpectedly stopped functioning on its own and only resumed normal operation after a system reboot.

Could you please help me understand what might cause FortiMail to stop logging without any manual intervention?

Also, are there any best practices or preventive measures I can implement to avoid this type of behavior in the future?

Thank you.