I would like to add a banner to received emails indicating that they are from "internal" or "external". I know I can use mail tips to indicate that users are sending/replying to an external address -however, I'd like the same kind of option on emails being received by users.
I know I can create a transport rule to "prepend" the subject line for internal emails, however, this is not ideal as makes searching by subject difficult. Is there any way to have a "mail tip" on these incoming messages?
TAG