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

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

Dear [NAME, ex. Link Building],

I am reluctantly writing to inform you that we are no longer able to uphold our job offer to you of  [DATE, ex. June 1, 1998] for the position of [STATE POSITION, ex. Sales Manager] at [STATE FIRM NAME, ex. ABC Co].  [STATE REASON, ex. Since you have not accepted our offer, we have hired an alternative applicant.  As you understand, we were pressed for time and needed to fill that position as soon as possible.]  Please accept our apologies. 

We wish you the best in your career.

Sincerely,

[YOUR NAME, ex. Jill Jones]