CF7 Custom Recipient – Changing the text

You can put this below code into theme’s functions.php file and check it. see this screenshot

function add_wpcf7_custom_recipient_meta_box_changed() {
    add_meta_box(
        'wpcf7_custom_recipient_meta_box',
        'Enter mail for inquiries', //just here to change text you want
        'show_wpcf7_custom_recipient_meta_box',
        get_post_types(array('public' => true), 'names'),
        'side',
        'high'
    );
}
add_action( 'add_meta_boxes', 'add_wpcf7_custom_recipient_meta_box_changed' );