Anything that depends on somebody remembering does not happen.
Create my free cardEveryone wants to wish their customers a happy birthday. Almost nobody does it two months running, because it means checking a list every morning.

You write the message and decide what you are giving. From then on it goes out on the right day, at the right hour for your time zone, to the right person.
You ask only for the day and the month, never the year. The treat arrives on the exact day with the bonus stamps you chose.
The email that lands seconds after someone joins, while they are still at your counter. It is the most-opened message you will ever send.
Write nothing and a sensible message goes out in your shop’s name. Write something and it sounds like you.
Only people who gave a birthday when they joined get one. If you removed that question from the signup form, there is nobody to greet.
In the morning of your shop’s time zone, not ours. A customer in Bogotá does not get their greeting at three in the morning.
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