Sample
[DATE, ex. Friday, February 10, 2006]
[NAME, COMPANY AND ADDRESS, ex.
Robert Brown
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate 85245]
Dear [NAME, ex. Robert Brown],
I just wanted you to know how much I appreciate the extra effort you made to cover for me during my period of absence.
I know how hard you already work, and I am well aware of the additional demands which my workload placed on you.
I have acknowledged the extraordinary efforts you made, and they will not be forgotten.
I hope to be in a position to reciprocate whenever you need me. Thanks again.
Sincerely,
[YOUR NAME]