Encryption Key

The Email Form use the Encryption class provided by CodeIgniter. In order to work with the Email Form you have to setup a key for the Encryption class first.

To do that you have to add a config for encryption_key in your config file ExpressionEngine docs

Example

$config['encryption_key'] = 'sy22k6QK6JzH38u4nLZ65bHOdK6VL89d';