Please try searching your topic in the search window at the top of the page before making any request... You can get a lot of related stuff, if you use proper key words....For now, please go through the attached file.
Courtesy: Mr. Peer Mohammed Sardhar (It was uploaded by him in this forum earlier )
Welcome to Cite HR.
I got these links from Google.
Writing Effective Email: Top 10 Email Tips — Jerz's Literacy Weblog
Business Letter, Business Letters, Business Letter Template, How to Write a Business Letter
To match up your requirements you can google the term and also there is plenty of material in citehr, you can run the serach term in the research tab given above and also by hitting options on the right side column.
I am giving you two links in which I have given my inputs. Would suggest you have a look at the inputs given by me as well as the inputs given by others in these links which may give you some more new insights into drafting good and effective communication.