Anytime you update or change your Message Rules, you can apply changes to messages in your IncrediMail:
- Click the 'Tools' menu (marked in red) and then 'Message Rules...' (marked in blue).
- In the 'Message Rules' dialog click 'Apply to Existing Emails' (marked in red).
- Click 'Browse...' (marked in blue), choose the Folder you want to apply the Message Rule to, and then click 'Apply' (marked in green).
- For multiple Folders, simply repeat this for each Folder.