Feature request: Update via email

Thanks for this great app and server.

There is a service in the US that gives free data for email, maps, and ride share apps. Updating via email would allow for use with this service, but I'm not sure how easy that would be to add or how much bandwidth it might possibly consume. Maybe just the use of an imap mailbox with the same account or the way imapnotes (Apple Notes) does its thing.