1.Open an BCC email
2.Select File > Properties

3.Look for Internet headers and find and save BCC identifier which looks something like this: X-MS-Exchange-Organization-Recipient-P2-Type: Bcc

4.Access the outlook on the web (OWA)
5.Select Settings > Mail > Rules

6.Create a rule and choose “Message header includes”
7.Copy in the value you found on step 3

8.Save rule

Logic behind this

• With Outlook rules, some are “client side” and some are “server side”. When you create them in OWA, they are automatically server side and will trigger regardless of Outlook client being open or not.
• If the rule is “client side”, then Outlook must be open for them to trigger. The specific predicate of the subject is available both client and server side.
• Creating the rule in OWA ensures it is completely server side, and that’s why it works when the rule is added to OWA, not to Outlook Desktop.