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README: Add info about sending user-encrypted email #88

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8 changes: 8 additions & 0 deletions README.md
Expand Up @@ -25,6 +25,14 @@ and `git-send-email` with ProtonMail.
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#### Can this be used to send email encrypted with a key that is unknown to ProtonMail?

No, ProtonMail doesn't allow encryption via your own keys in Enigmail / Gnupg client. Just like in ProtonMail's Bridge app, you will get an error when trying to send email that has already been encrypted with a PGP key they don't recognize:

> 554 5.0.0 Error: transaction failed, blame it on the weather: cannot upload attachment: [11101] Invalid input. Please check the message and try again.

If you [provide ProtonMail with the private key](https://protonmail.com/support/knowledge-base/pgp-key-management/) through your account (not recommended), it may work, however this has not been tested.

## Setup

### Go
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