"I would like to commend QPS for the exceptional service you provided me. The timing coincided perfectly with my scheduled move from St. Louis, MO back to Milwaukee. I was truly appreciative of your follow-up communications during my interim probationary period, which confirmed my job satisfaction."
In a professional setting, it is important to protect your company's integrity. Gossip is one of the fastest ways to damage credibility, and the moment that a business lacks credibility, all sorts of things can go wrong.
Credibility builds trust, and it is vital for clients and employees to trust one another with information, duties, and responsibilities. In order for companies to have long lasting relationships with their employees and clients, trust is a key factor.
Unfortunately, there is no foolproof way to stop gossip from happening in the office. Try to live by the saying: "If you can't say something nice, then don't say anything at all." If you hear something but are not 100% positive it's a fact, don't repeat it.
Stick to working hard and avoid the office gossip. It will pay off for you in the end!