Reply To: adding a footnote to emails

@ Alfonso

The code can be added by using the Code Snippets plugin. Install this plugin and add a new snippet with the following code:

add_filter( 'cn_email_message', 'cn_append_email_message' );

function cn_append_email_message( $message ) {

    $append = "\r\r" . 'This email has been sent via the ' . get_bloginfo( 'name' ) . ' website.';

    return $message . $append;
}

Make sure you Save and Activate the new snippet.

Hope that helps!