Q: Mac Server: Reboot, all mails gone

Hi all,

I am running a Mac Server 10.11.6 with Server App 5.1.7.

Today, I rebooted the whole machine and after that, I noticed that all mails from an account stored on the Mac Server were gone - they were no longer in the inbox.

I looked in the trash and some of them were there, so I could recover them. Still, this seems like a big issue to me: Whenever I reboot the server, all mails from all mail accounts seem to be gone. This shouldn't be the case - mails should be stored in the inbox and survive any reboot.

Or - is there any setting that prevents mails from being deleted at reboot?

Greets