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I think Tutanota (or just Tuta now?) does this, since search works correctly.

I think not using PGP helps Tuta a lot with this, since PGP is really outdated and does not play well with modern features.

XMPP is often neglected even though it’s the most secure, private, fast, and reliable framework for end-to-end encrypted messengers.

This. I studied on how e2ee works in XMPP when I was trying it a few years back. It is absolutely atrocious. I have seen half-assed school projects with better security than most XMPP clients. Largely caused by encryption being bolted on through an extensions of the standard as an afterthought and going throug several revisions. Its usually not even enabled by default.

Now you may find a good client implementation, I think conversations for android seemd decent, but with everyone using a different client and no way to ensure the other side uses a secure one, there is little point.

This post is the personification of why downvotes should be enabled.

Sure, but there are good reasons not to use XMPP if you need security.

Quite possibly not. Remember that the admins running lemmy instances have very limited revenue so paying for servers is an issue. Some instances even encourage posting links instead of images to save on cost.

Videos are in a league of their own when it comes to size and therefore the server power needed. Lemmy probably can’t afford it. Its the price we pay for freedom and no ads. You have to link videos.