• The BIND DNS server has already been deprecated and removed from Plesk for Windows.
    If a Plesk for Windows server is still using BIND, the upgrade to Plesk Obsidian 18.0.70 will be unavailable until the administrator switches the DNS server to Microsoft DNS. We strongly recommend transitioning to Microsoft DNS within the next 6 weeks, before the Plesk 18.0.70 release.
  • The Horde component is removed from Plesk Installer. We recommend switching to another webmail software supported in Plesk.

Resolved How to force impa/pop3 connections in SSL/TLS and not in clear?

Please consider to tell in the thread which System (OS, Plesk, courier or dovecot) you are running, then you might get faster a qualified answer
 
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check out /etc/dovecot.conf or conf.d, and if you like disable insecure imap and pop3 protocols and only offer imaps and pop3s in combination with setting disable_plaintext_auth = yes
and test your configuration then.
 
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