How to fix mail server error: "imapd-ssl: Unexpected SSL connection shutdown."

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http://serverfault.com – After updating Plesk control pannel from 9.5 to latest 11.0, I am having problems with email - Outlook gets disconnected repeatedly. I am using QMail for SMTP. I looked in the mail log file and it says: imapd-ssl: Unexpected SSL connection shutdown. This line is repeated in the log file every around 30 seconds. What went wrong? How to fix it? (HowTos)