Usualy, people who receive these types of mail dont read them fully because they have such impression in their mind that it will contain full copied meaningless sentenses like how they've enjoyed their so called"Great time" they spent, and how they would like to thank everyone right from the CEO of the company to the gatekeeper.
So,dont just let it be a copied goodby mail, add some interest by adding your image which will completely change the look and feel of the mail and say something which you feel...
Hey Guys, I sent these mails when i left my previous companies. You may also use them and edit as per your use. I hope you will like them. Just try and it will be a all new idea for you. Give up those long text mails and do like what i did...Enjoy..!! If you also need more ideas and want my help in designing such mails, just mail me at honey2005@gmail.com
when i left my previous organization:

Also this one






