• 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.

Plesk 11 How to Update Horde 4 -> 5

every webmail package that is installed by a controlpanel will always be out of date very soon after the release of that controlpanel. All it takes is 1 single security update to be released.
The best thing you can do is install your own horde via pear and then register it in plesk as an external webmail program.

http://www.horde.org/apps/webmail/docs/INSTALL

if you dont want horde i suggest roundcube as a good alternative.

regards
Jan
 
Hello

Thank you very much for your answer, it seems a bit complicated to install Horde
I'll try to say the alternative, if the install is not complicated.

greetings
Juan Carlos
 
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