But even if email-via-notification worked, it is still pretty much unusable. My usecase is to get to wifi, download emails and get offline, but with Proton mail I'd have to be super careful not to have my app open when enabling connection to wifi, otherwise it instantly downloads all headers and shows no notification, because app is in a foreground, after that there is simply no way to download message bodies other than opening them one by one in all folders. Surprisingly support saw not problem with this UX either.