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Courier POP3/IMAP server restarts after 12.5.30 upgrade

fruf

Basic Pleskian
I've upgraded my server yesterday, it seems everything went well except I started to receive watchdog emails like this every five minutes:

The Courier POP3 Server with SSL/TLS support service on host xxx is down.
The Courier IMAP server with SSL/TLS support service on host xxx is down.
The Courier IMAP server with SSL/TLS support service on host xxx has been started on..
The Courier POP3 Server with SSL/TLS support service on host xxx has been started on..

This morning there were more than 300 of these in my mailbox. Checked the logs but could not find anything specific, after that tried to switch from qmail to postfix but I still receive the messages. What could be the problem?
 
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