Step 1: Navigate to the Options Menu

Once you log in, click on the cog in the upper right hand corner of the screen, then select View all Outlook settings.

Step 2: Select the Inbox and Sweep Rules Menu

In the options menu, select Mail -> Rules -> Add new rule.

Step 3: Create a New Rule and Rule Specifics

The following screen will open when you select Create new rule

Step 4: Name the Rule

You can name the rule whatever you'd like.  For this guide we have named the rule test.

Step 5: Setting Subject Condition

Under the Add a condition, select the drop down menu and chose Subject includes under the Subject

The word you'll want to add to the rule is Undeliverable and then you'll click the + icon.

Step 6: Setting Up Date Span

You'll want to click the Add another condition button

From the drop down box select Before under the Received section

For the date you'll want to select is 2 days from the current date.  In this example today's date is 11/27/2019.  So the date picked is 11/30/2019 so that for the current date and over the next two days the rule will be applied.

Step 7: Setup the Action to Delete

Under the Add an action section you'll want to select the drop down box and then select Delete under the Organize section

Step 8: Verify Final Settings

Make sure that your rule looks similar to the image below, with the date being set according to Step 6.

Make sure that the check box at the bottom of the screen for Stop processing more rules is unchecked.