There are 3 different kinds of email services that only have limited interoperability: * Corporate email services, aka Outlook/Exchange * Surveillance email s

There are 3 different kinds of email services that only have limited interoperability: * Corporate email services, aka Outlook/Exchange * Surveillance email services, aka Gmail, etc * Real email services that expose the raw email database, such as Maildir, to the users. For the first 2 kinds, I'd rather POP and keep my interaction with them to the minimum. For the last kind, IMAP/JMAP is too limiting in capability.