can't email to default mailbox

I had to reboot my server and now the email seems to be messed up. I get this message trying to test the default mailbox, this is the only mainbox on the server. The mail is sitting in the queue.

(temporary failure. Command output: Can't open log file /var/log/dovecot-info.log: Permission denied)

Hello,

check if the file  /var/log/dovecot-info.log is exests and has permission for Dovecot user.