Quoted
We’re excited to announce the release of Zulip Server 12.0, containing hundreds of new features and bug fixes: end-to-end encryption for mobile push notifications, a major upgrade for Docker, configurable image previews, and much more! Almost 5,500 new commits have been merged across the project since the 11.0 release in August 2025.
Zulip is an organized team chat application ideal for both live and asynchronous communication. With Zulip, you own your data: it’s 100% open-source software, with easy migration between cloud hosting and self-hosting, plus a powerful API.
I don’t see how E2EE would be that important for Zulip. It is mostly used in Teams who work together on a project or for a specific business/company. They all know each other (or at least part of the Teams) and share the information. And it is (typically) run on dedicated hardware owned by the Team.
So i personally see no benefit for E2EE in these kind of contexts.