对完整答案见法典：http://codex.wordpress.org/Plugin_API/Action_Reference/delete_user

所以我不会再发布它的代码

function my_delete_user($user_id) {
    global $wpdb;
    $email = $wpdb->get_var("SELECT user_email FROM $wpdb->users WHERE ID = \'" . $user_id . "\' LIMIT 1");

     $headers = \'From: \' . get_bloginfo("name") . \' <\' . get_bloginfo("admin_email") . \'>\' . "\\r\\n";
     wp_mail($email, \'You are being deleted, brah\', \'Your account at \' . get_bloginfo("name") . \' is being deleted right now.\', $headers);
}
add_action( \'delete_user\', \'my_delete_user\');