[Date]
[Name],
[Company and Address]
Dear Mr. / Ms. ———[Name],
I would like you to know how pleased I am of the extra effort taken by Mr. / Ms. —-[Name of the employee, exp. your salesman]. [State activity being complimented / Thanked, exp. When our order was delayed due to lack of stock, Bill took it upon himself to arrange for special delivery from your manufacturing plant.]
You are certainly fortunate to have Mr. / Ms. ——— [Name of the employee] at your firm. We are indeed pleased with [his/her] efforts.
Sincerely,
[Name & Signature]