The Problem

E-mail spoofing/impersonation is a huge threat to many companies today. A very common approach by scammers is to send your users an email using the display name of a real person within your company. Many users will glance at the email and see the display name and be none the wiser. A popular defense against this is to tag all external emails with a banner, letting the user know that the email came from an external source. The biggest problem with this method is that it tags all emails, which over the course of a few months, could be thousands of emails for a single user, causing them to begin to ignore the banner altogether.

So I like to create mail flow rules in Exchange to only append a banner if the email originates from an external source, and the display name of the sender matches a display … Continue...