Hi,
Previously I've used the script underneath as a fast way to mark everything in my Mail as read; including junk mail and every account. I've got a lot of emails coming that's good to have, but doesn't require any work - so the workflow works as a way of purging the system for unnecessary unread mail. However, after switching over to Airmail on all platforms (A great idea that I should've come up with earlier) I quickly noticed how much I missed the workflow. By all means, I'm no tech-wizard and the furthest I've gone in my quest to get this working is exchanging "Mail" with "Airmail 3"