Click Edit > Preferences, then click Mail Accounts.Select the account you want to use securely, then click Edit.Click the Security tab.Specify your key ID in the PGP/GPG Key ID field.Click OK.Click Close.Evolution requires that you know your key ID. If you don't remember it, you can find it by typing gpg --list-keys in a console window. Your key ID is an eight-character string with random numbers and letters.
