How to create Mail transport rules in Microsoft Office 365

Log into your Office 365 Admin portal and go to Exchange administration (“ADMIN” -> “Exchange”), as shown in the image below.
Go to “mail flow” section.
Under “rules“, click on “+” button and select the option “Create a new rule…“.
The new transport rule window will be displayed. Give the name for transport rule in Name dialog box. Select the condition to apply this rule, from the drop-down. In following image, we selected “The subject or body includes…” rule.
Enter the keywords you want to filter in text dialog box, as shown in the image below.
Click on Plus (+) symbol to add desired keywords and click “OK“.
Next step, specify the action, if the condition is satisfied. From the “Do the following…” drop-down, choose any option like “Delete the message without the notifying anyone“.
Select the Audit level and the enforcement level for the rule. Click on “Save” to save the changes.
Now, you can see the rule created along with it’s description on your window screen.