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by mildred593 1119 days ago
The problem with the proxy is that to be efficient, I believe the proxy will need to store all IMAP messages in an indexed form on the proxy-side.

The problem with IMAP is that some requests are not possible efficiently, and the real breakthrough of JMAP is that those requests are now possible and clients are now allowed to be fast. For that though, the server-side JMAP needs to access the indexed mail store directly.