1. Keep it short. Customers won't read long notes.
2. Make it personal. Print the note yourself. Add your own stamp instead of company postage marks.
3. Don't overdo it. If you send notes a lot, the gesture will lose its appeal. Generally a note every three months is reasonable.
4. Don't always try to sell them something. The most effective notes are the ones that aren't connected with a selling opportunity. Let customers know you're there to help them, and thank them for their loyalty.
