Use an email service that supports built-in encryption
Enable end-to-end encryption if available
Set up S/MIME with a digital certificate
Set up PGP or GPG with public and private keys
Exchange public keys with the recipient
Verify the recipient’s key fingerprint
Compose the email
Encrypt the message before sending
Encrypt attachments before attaching them
Send the encrypted email
Share the decryption key or password separately if using password-based encryption
Confirm the recipient can decrypt and read the message