Mail handlers - adding / editing
1. Go to the Incoming Mails configuration tab and choose Mail Handlers under the INCOMING MAIL HANDLERS menu item to see the list of mail handlers.
2. Click the Add button to add a new mail handler.
3. Click the three dots next to the name of a mail handler and choose Edit to edit them.
The Edit Mail Handler configuration dialog has four tabs. Find the details about the tabs on their respective sub-pages: Filtering, Finding issues and Setting up rules and actions in the actions editor.