Get the Whitepaper called Bypassing Spam Filter Using Homographs. Some generation code is also included.
You can download it from the following link: https://packetstormsecurity.com/files/download/115090/bypass_spam_filters.tgz
Source: https://packetstormsecurity.com/files/115090/Bypassing-Spam-Filters-Using-Homographs.html