Since Plesk Obsidian RC4, users’ Microsoft Outlook and Thunderbird mail clients can now be automatically configured based on entered emails.
Thank you for your input. We will consider the possibility of implementing this feature in upcoming releases.
— ESMarcel commented
This would be so helpful. Hopefully it will be implemented soon, at least as an extension. Sogo works like a charm and it's features are way better then Roundcube or Horde - plus the design fit's the new Onyx pretty well.