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by mildred593 1120 days ago
Offline is just a matter stable identifiers on the server. It's the client that is responsible for caching the e-mail content on the device.

Also, the fact that JMAP makes it convenient to only download part of a message, and let the server do all of the message parsing does not encourage the client developer to do much processing client-side and keep e-mails blob in cache to be processed offline.