Depending on what industry you’re in, acquiring a new customer is anywhere from 5 to 25 times more expensive than retaining an existing one. Also, customers are the greatest ambassadors of your brand. This is why you should invest in efforts that keep your existing customers happy, and reward your more loyal and profitable customers via thank you email messages.

One way to reward customers is to offer them something exclusive. It could be giving them access to a new product or service that hasn’t officially launched to anyone else, inviting them to a premium event, or allowing them to take advantage of a discount. Another advantage of rewarding your customers is that it helps build a stronger relationship with them because they will feel valued and appreciated.
In order to share this something exclusive with your customers, send them a dedicated emailing campaign:
Result
Increasing customer retention by 5% can increase profits from 25-95%.