I mean, they give you MBOX export and forwarding forever even if you stop paying them. What else would you want them to do? The feature stack would be impossibl

I mean, they give you MBOX export and forwarding forever even if you stop paying them. What else would you want them to do? The feature stack would be impossible to implement on IMAP, and all of the features would have to be exposed in every client anyway. They are trying to change the paradigm for people who hate how email works today, and I don't think that'd work if they said "Okay, first, add this new address to Mail on your iPhone. Cool. Now if you go on our website you'll get a great email experience." (With that being said, there's no reason they couldn't publish an API so someone else could write a client...)