Rule to help clean out Junk folder

You can match a specific symbol such as 🚨, but classic Outlook rules don’t support a general “contains any non-alphanumeric character” condition or regular expressions.

For that example, create a rule with “with specific words in the subject” and paste 🚨 into the words list. Then use Rules > Manage Rules & Alerts > Run Rules Now to run it against your Junk Email folder. Automatic incoming rules generally won’t process messages already diverted to Junk.

Start with “delete it” rather than “permanently delete it” so you can check the results. Matching every non-alphanumeric character would also catch ordinary punctuation in genuine messages.