> It would be nice to see config dialogs where user’s are asked for > minimal information (user name, perhaps server name) and then the device > discovers what is available there (Mail/Contacts/Calendar/…) and offers > the user a way to select them and Of course. The way you do that is with service discovery, not by glomming everything into one swiss-army-knife protocol. We have RFC 6186 which provides a straightforward way to discover submission, pop, and imap servers for a domain. Nobody uses it, and people who run large mail systems tell me that's because it's not granular enough, they put different users on different servers so they need to be able to provide per-mailbox configuration info. That doesn't seem to me to be a terribly difficult problem, but it's not one that I believe JMAP does or should try to solve. R's, John