[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 have just heard that you have landed the [NEW CUSTOMER, ex. Albert Industries] account.  Allow me to congratulate you!  I am certain that this was the result of great work and diligence on your part and  I am certain a prosperous and long business relationship will ensue.

Best regards,

[YOUR NAME, ex. Jill Jones]