[DATE, ex. Monday, March 31, 2008]

[NAME, COMPANY AND ADDRESS, ex.
Link Building
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate  85245]

Dear [NAME, ex. Link Building],

I would like to take this opportunity to thank you and your staff for [STATE ACTIVITY BEING COMPLIMENTED/THANKED, ex. taking the extra effort to process our rush order of your Venetian granite].  [STATE RESULT, ex. I would like you to know that our customer was extremely pleased with the results and would like to install the same type of granite in his hallways.]

We are indeed pleased to be dealing with you.

Sincerely,

[YOUR NAME, ex. Jill Jones]