Secure, Private AND anonymous IM (compatible with linux)

I've dived deep into the r/privacy [FAQ](https://www.reddit.com/r/privacy/wiki/index/), and I still have haven't found exactly what I'm looking for. If there isn't a solution to this yet, please let me know.

I'm looking for an IM (instant messenger) that intersects with the big 3 concepts listed in the FAQ (privacy, anonymity, security). Signal is secure and private, but not anonymous. Same with Threema if I'm not mistaken (although it's not mentioned in the FAQ).

I've previously used Session and that's one …

anonymous linux privacy