Configuring preferences and options in Outlook.com
May have a solution though not sure if it covers all instances. Have set up a rule as follows which has been working for me in the past hour.
- Create a Rule named Red Balloon
- Add condition - Message header includes ... cut and paste red balloon icon into the value box. (you can copy paste the red balloon icon from the email address of the sender e.g. <#####.red balloon icon here@######.com)
- Add Action - Move to - Junk Email
Edited rule to include a mountain icon ... guess will need to amend as more special characters are coming in via email addresses.