Instead of just "dear customer" or "greetings" as a salutation, customize it with the name of the person ordering it. Depending on the size of your business, you can introduce yourself in this note. As marketers and business owners, we're often tempted to shoehorn a call to action in everything we write. A thank-you note is the worst place to do this. To close, a simple sign-off is all you need. If your note is printed rather than handwritten, you might want to sign the closing of your messages. Even that additional personal touch can be better than nothing.