[quickthrower2]

Nope because the user encrypts them using their own secret. No access to historical emails but possible to backdoor the JS later on.

[chrismorgan]

If your code running on the user’s computer can use the secret provided by the user to access email, your code can steal the secret.

Running the encryption no the user’s computer instead of your own servers is not a panacea, because you still control the code.

[zAy0LfpBZLC8mAC]

So, it is possible to backdoor the JS lateron, but it is impossible to use that for accessing the emails? Could you explain how that works?