Sorry; I was being unnecessarily ironic because there really is no "quantum safe" things yet. Otherwise nice work; always nice to see more competition in this space!
We are the *only* email service provider that is 100% open-source. Proton Mail [1], Skiff [2], and Tuta [3] all have closed-source back-ends, despite advertising as closed-source.
RE: Quantum Safe:
ChaCha20-Poly1305 is generally considered to be quantum safe [4] [5].
I am not an expert in this space but, as far as I can tell, these are all work-in-progress, as is quantum computing itself. There are several research groups and committees involved, including at, say, IETF and the like.
