RE: Competition:

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].

[1]: https://www.reddit.com/r/ProtonMail/comments/b847n7/comment/...

[2]: https://www.reddit.com/r/Skiff/comments/10yn8a5/comment/j811...

[3]: https://www.reddit.com/r/tutanota/comments/10hghin/comment/j...

[4]: https://crypto.stackexchange.com/questions/79518/is-xchacha2...

[5]: https://old.reddit.com/r/crypto/comments/suk2k7/is_chacha20p...