您可以将下面的代码放入主题functions.php 归档并检查。看到这个了吗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\' );