Step #1: In Outlook, click on the Tools menu, highlight Message Rules, and then click Mail....

Step #2: Create a new rule using the New button on the upper right side.

Step #3:
In the first box, select with a checkmark Where the Subject line contains specific words.
In the second box, select with a checkmark Delete it.
In the fourth box, enter a name for this rule (we chose to call it SPAM).
Now back to the third box, click on contains specific words.

Step #4: In the top text box, Type {SPAM?} or the particular phrase you want to filter messages on. Then, click the Add button.

Step #5: Click OK to these 3 windows to exit and save your Message Rule.
Repeat Steps #2-5 for any other Message Rules you want to create. We recommend having one for {SPAM?} and one for {SPAM!}