Surprise: Customer loyalty is the key to success. And you can reward your loyal customers by giving them something for free every now and then. Create a “surprise” email that sends an automated email to your best customers that offers a free yearly license to your software for them to use, a gift card or even a coupon code to redeem a box of cupcakes. It’s a small cost for your business but, the reward is huge!
When you're using email as a marketing tool, you're working on a pretty personal basis. This isn't ‘drive-by' stuff -you're directly targeting customers from their inboxes. There's a huge amount of potential which comes with this kind of marketing... but you'll only reap that potential if you REALLY understand both the marketplace you're operating from, and the audience you're talking to.