- Go Tools & Settings > Spam Filter Settings > Black List (or White List) > Add Addresses > From file
- Create file with some email addresses like:
- Upload the file
The file cannot be uploaded. An error occurs:
Error: The uploaded file is empty.
This is Plesk internal issue #PPPM-2737 , which has been fixed in microupdate #45 .
Apply latest Plesk microupdates .