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No, you didn't do anything wrong. Every year around August 1st we have to contact Plesk and renew our licenses for another year. Last year they were pretty quick to approve our renewal, but this year their legal department had a few questions for us, and of course anything involving lawyers takes forever. Our licenses expired while they were pushing paper around and went into a grace period mode. During that grace period a lot of SSL certificates got messed up, and all sorts of stuff broke. It has been causing some downtime for Nginx last week while we cleaned up the mess. This storage engine error was similar because dovecot, the mail server software, was refusing to restart because there was a missing mail SSL certificate. Once I fixed the config files it restarted without any problems. Thanks for reporting the issue.

Does it work now?

Thank you very much, sorry for my mistake