Implement external banner using exchange online
Some of the company do not enable external banner for sender outside of the organization. In this blog, we will perform a basic and yet, effective banner so all users are being informed or reminded for their safety every time they receive an email from external. We have 2 goals: 1. Create a company's custom banner for external emails 2. Insert EXTERNAL tag in the email subject without duplication Lets get started: Create Mail flow rule for External banner message 1. Login to exchange admin center 2. Click Mail flow > Rules 3. Click Add a rule > Create a new rule 4. Fill this up: Name: External message warning rule Apply this rule if: The sender: is External/Internal > Outside the Organization CLICK Add a new condition The recipient: is External/Internal > Inside the Organization Do the following: Apply a disclaimer to the message : prepend a disclaimer CLICK enter text: Prepend '<p style="border:1px; border-style:solid; border-color: #FFCACA; background-co...