可以将筛选器应用于comment_notification_text:

1525            /**
1526             * Filter the comment notification email text.
1527             *
1528             * @since 1.5.2
1529             *
1530             * @param string $notify_message The comment notification email text.
1531             * @param int    $comment_id     Comment ID.
1532             */
1533            $notify_message = apply_filters( \'comment_notification_text\', $notify_message, $comment->comment_ID );