Thunderbird 91+ Digitally sign/encrypt emails with OpenPGP

## Setup In Thunderbird 91+ Go to the menu on the right, select `Account Settings` Go to `End-To-End Encryption` Go to `Add Key` Select `Create New PGP key` It's recommended that the Key expires eventually (here 1 year) Keep the `Key Type` as `RSA` Change the `Key size` to `4096` Click on `Generate Key` Click `Confirm` You can export the file that contains your public key block anywhere. ## Use cases ### sign email Let’s try e-mailing someone to see what a signature looks like. “Digitally Sign This Message” is NOT encryption. ### encrypt email Encrypting the email will only work if you have the recipients Public PGP Key Block. It will automatically in Thunderbird attach two files to the email, one is your Public PGP key block that others can use to send you encrypted messages. The other is your PGP signature, which certifies the integrity of the email. "Digitally signing" the email with OpenPGP in Thunderbird will give the recipient YOUR public PGP key block. They may