• Debian 11 is approaching its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.80 will be the last release to support it.
    If you are running Plesk Obsidian on Debian 11, we recommend you upgrade those servers to Debian 12 using our dist-upgrade tool.
  • We plan to deprecate and remove the support for XML RPC protocol versions earlier than 1.6.9.1 in Plesk Obsidian 18.0.82. We strongly recommend that you update all existing integrations using earlier versions of the XML RPC protocol to comply with the version 1.6.9.1 specification.

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
 
Last edited:
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.
 
Back
Top