Do you plan to support custom domains? I'd like to use random_nonsense@my_own_domain.com, so that even if OwlMail disappears, I can do something about all the mail I would be getting.
If you use a custom domain (without thousands of users), you lose the anonymity benefit of Owl Mail (the custom domain itself becomes the identifier). Which means BigCoA and BigCoB can still trade/sell tracking/advertising info on you.
