Click this button so that it is checked and your PGP encryption is activated for all subsequent emails. To do this for all future emails instead of just one, go to “Settings -> Security” and scroll down until you see “Auto-attach public key” under External PGP Settings.
Now that it’s checked, your email will be encrypted with PGP. Click on it and then on “Attach Public Key” in the dropdown menu. Once you mouse over it, the “More” option will appear. 
Once the new message window opens, go to the bottom of the format bar on the far right to click the up arrow icon. When you log into your ProtonMail account, preferably using a good dedicated password manager, click the big “Compose” button in the top left corner above the Inbox to create a new email. Read: How to View Ring Cameras on the Web Attach public key When you use PGP to send email, you need the recipient’s public key. PGP algorithms work by generating an encrypted session key. Due to end-to-end encryption, no one can intercept your message. You must not share or share your private key with anyone. Your message would be signed by them using your public key to decrypt using your private key. You must know the public key of the person to whom you want to send an encrypted message. PGP’s workflow is almost entirely password-based. It basically works on Linux, macOS and Windows. 
PGP is used to sign, encrypt and decrypt texts, emails, files, directories and entire hard drive partitions and to increase the security of email communications”, Wikipedia. “Pretty Good Privacy is an encryption program that provides cryptographic privacy and authentication for data communications. Check How to Set up PGP Encryption in ProtonMail
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