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,

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/ejysilb/ https://www.reddit.com/r/ProtonMail/comments/b847n7/comment/... [2]: https://www.reddit.com/r/Skiff/comments/10yn8a5/comment/j811jki/ https://www.reddit.com/r/Skiff/comments/10yn8a5/comment/j811... [3]: https://www.reddit.com/r/tutanota/comments/10hghin/comment/j5in1wp/ https://www.reddit.com/r/tutanota/comments/10hghin/comment/j... [4]: https://crypto.stackexchange.com/questions/79518/is-xchacha20-poly1305-quantum-resistant https://crypto.stackexchange.com/questions/79518/is-xchacha2... [5]: https://old.reddit.com/r/crypto/comments/suk2k7/is_chacha20poly1305_quantumsecure/ https://old.reddit.com/r/crypto/comments/suk2k7/is_chacha20p...