A good automated message does not sound like a robot. It is short, personal and useful: the customer's first name, the information they need, and one clear action. If it is too long or too salesy, it gets ignored.
It all comes down to the trigger. A message goes out because something has happened: an order, a booked appointment, an unpaid invoice. Before writing, list these key moments in your customer relationship. Each one can become a scenario.
The channel matters. Email suits documents and details. A WhatsApp message is often read more quickly, but should stay rare and expected. Use each channel for what it does best, and do not duplicate every message.
Mind the rules. Messages linked to an order or an appointment are generally accepted. Marketing messages most often require prior consent under the GDPR and the rules in your country, and a simple way to unsubscribe. If in doubt, have your promotional messages checked.
Finally, test before switching on. A message sent twice, with the wrong first name or at 3 in the morning, damages trust. We test each scenario with test contacts before launching it for real.