Hello @Bakker, Ron,
Based on your problem description, I would like to ask if your two rules are set up according to 1. Add a banner if the sender is from an external organization. 2. Add a banner if the sender is from an external organization, except for incoming emails with multipart signatures and/or multipart encryption . If the rules are set up in this way, then the rules for adding a banner will indeed be duplicated, and your requirements will only need to be set up in accordance with the second rule, as shown in the screenshot. If not, please provide how it was configured and I will advise you!