Please try the following in Outlook 2021 after installing Spamfighter:


  1. Select “File” in the Outlook main menu.
  2. Select “Options” at the bottom of the left side menu.
  3. Click on “Add-ins” at the bottom of the left side menu.
  4. Click on “Go” next to the “Manage: COM Add-ins”
  5. Find “SPAMfighter Add-in” in the list, and check the associated box.
  6. Click on “OK”