This is why I used it. Ultimately, I ported my domain to Fastmail, where it’s possible to edit filters in the mobile app. Fastmail also makes it really easy to

This is why I used it. Ultimately, I ported my domain to Fastmail, where it’s possible to edit filters in the mobile app. Fastmail also makes it really easy to choose the username from which to reply. You don’t have to create a dumbass alias address.