↳ In-reply-to » It's ok for most encrypted protocols (In salty you can fetch other messages but can't decrypt). Btw i think recipient can be removed so if someone seen message they tried to decypt, if can't - its not message to you

here are a few ideas you might take into consideration when designing a secure IM https://developer.virgilsecurity.com/docs/e3kit/fundamentals/secure-instant-messaging/

Obviously if you’ve worked on something similar, you already know it, he