Setting up GPG for your mail account
You need a GPG key to do this. If you do not have one yet, please refer to Creating a GPG key.
Select Edit ▸ Preferences ▸ Mail Accounts.
Select the account you want to use securely, then click Edit.
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Specify your key ID in the OpenPGP Key ID field.
Below the field you can choose whether to always sign outgoing messages when using this account, and other options.
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Evolution requires that you know your key ID. If you do not remember it, start Passwords and Keys, go to GnuPG Keys, select the preferred GPG key, right-click on it, select Properties and copy the Key ID. Your key ID is an eight-character string with random numbers and letters.