[Your letterhead, if desired; if not, your return address]
[Date of letter-month, day, and year]
[Recipient's first and last names]
[Street or P.O. box address]
[City, State ZIP code]
Dear [recipient's name]:
I just want to take a moment today to let you know how much I appreciate the excellent job you did on the recent new business pitch. Your expertise and hard work made a pivotal difference in our company's ability to secure business from our two new clients. As a manager, it is a privilege to work with someone who has your level of capability and initiative.
Thank you again, on behalf of myself and company management, for a job well done. I look forward to completing many more successful projects with you in the future.
[Sender's first and last names]