First of all, you have to create your mailing list. The best way to create a good mailing list is to keep the information regarding the customer. You can ask the customers about their names, addresses and contact numbers at the time of purchase. You must know that the customers often feel inconvenient about giving their personal data during a purchase. However, if you offer them some kind of incentive e.g. a lucky draw or a gift hamper, they will not hesitate to provide their personal information. If you are still facing some problems in gathering the personal data of your customers, you can buy the information from different agencies which keep consumer records.
After finalising the mailing list, you have to work on the advertisement. Write a good message which you will mention on your postcard. You can write anything on the postcard. For instance, if you are looking forward to introduce a new product, you can write about it on your postcard. In contrast, if you just want your customer to visit again, you can just add a friendly message like ‘We will wait for your arrival’, ‘Thanks for your visit, please come again’, ‘We enjoyed serving you’, ‘We are really happy you came’, You made our day’, ‘We appreciate your visit’, ‘You made our day’ or ‘Please remember us’.
You can also give different kinds of discount coupons along with the postcards to your customers in order to attract them. Keep your promotional offers simple so that the customers can easily understand them.