This one is more about personal preference than anything else. Some people I know will swear by them and they send out a thank you card with each sale. Other business professionals will send out thank you emails versus cards.
If your business sends email receipts/invoices to your customers then take this time to say thank you. Not only with this will save on postage but it will eliminate the extra step of sending out an actual thank you card.
If you feel compelled to send them out something in the future, send a birthday note, reorder reminder or holiday card. Whatever you decide to do, keep consistent. Make it happen!
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