Thank you for creating this app. It has proven to be incredibly useful for me, especially since I rely heavily on Fastmail and its masked email service. One feature that I find myself missing is the ability to switch between my different domains used for masked email. It would be a great addition to an already impressive app.
Thank you.
AFAIK, there is no API for a such thing, but I could be wrong. I'll definitely do it, if it's possible at all.