Create a Thunderbird plugin to use Axolotl as email encryption

[rubo77]

Would Axolotl Ratchet protocol be suitable for encrypting email communication?

https://security.stackexchange.com/questions/83083

This would be perfect as a replacement for PGP and SMIME

[neuhaus]

With GPG/PGP and S/MIME, the mails typically remain encrypted in the MUA and are only decrypted on demand, providing confidentiality and signatures even long after the messages have been received.
With Axolotl my understanding is that you'd have to decrypt the messages rightaway and use some other form of on-disk encryption to keep them confidential.

Also, as mentioned on Stack Exchange, the synchronization is a difficult problem, many people use more than one MUA (i.e. phone, tablet and multiple desktops and/or laptops).