[onereplyac]

Normal email proiders don't dowbload all emails whenever a user logs into a new device

[amilich]

We also don't do this. In a near future implementation you can just synchronize the end-to-end encrypted search index.

[raggi]

This step is what I was expecting you to talk about, and it has some tricky subtleties to get right, which is why I looked for it in the whitepaper.

A trivial problem with a naive implementation is being able to perform presence proofs using side channel information: send someone mail containing a terms you want to verify, and watch for the associated high level costs affecting operations that are likely to be incremental index change uploads.

[onereplyac2]

You mean you currently do this but plan not to in the future