Custom keyboard shortcut to paste a pre-defined text?

1. Create .bat file
2. Insert below text clip < "myemail.txt"
3. Create myemail.txt file and write you content
4. Create shortcut and assign short key for batch file
5. When ever you want paste the content press the short cut key , it will copy the text into clipboard, just have to paste the text. .txt,.bat create any where but short send to desktop and assign short key.

Autohotkey will do exactly that (although there are many similar apps). See http://www.autohotkey.com/docs/Hotstrings.htm for your specific requirements