- Plesk for Linux
- PHP 8 is installed on Plesk server
- Plesk Premium Email extension shows the warning:
PLESK_WARN: Necessary packages are not installed.
- Pressing button Install and refreshing the page shows the same message again
This is a cosmetic issue on Kolab side which is used as a backend for Plesk Premium Email. It's reported to them and must be fixed in upcoming updates.
Please ignore the warning and update the extension once a new version is available.