Progress on JMAP, better standard for synchronising mail, calendars and contacts
This might be a naive question, but I don't know any better: Why can't your mailbox be represented on a server as a directory, perhaps like Maildir format, and then synchronised to your device using a directory sync tool, such as rsync?<p>Changes, or online access, could be done using any standard remote file access method, such as sftp.<p>Are there downsides to this approach?