• The APS Catalog has been deprecated and removed from all Plesk Obsidian versions.
    Applications already installed from the APS Catalog will continue working. However, Plesk will no longer provide support for APS applications.
  • Please be aware: with the Plesk Obsidian 18.0.78 release, the support for the ngx_pagespeed.so module will be deprecated and removed from the sw-nginx package.

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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