• Debian 11 has reached its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.81 is 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.

Question webmail nicht mehr erreichbar

If you are not the admin of the server, contact your hosting provider, as most likely admin access is needed. (mentioning as the domain you provided point to a shared hosting like panel)
Also seems some custom setup with "services/portal"
 
webhoster.de seems to be the shared hosting provider, and not the webmail.
windows 11 home is not a server OS.

Do you have root access or access with username "admin" to plesk?
 
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