You will be able to keep marketing to all the clients who have opted in before May 25th, 2018, on the basis of legitimate interest. You should, however, ask them to refresh their consent in a GDPR compliant way when they next visit the salon.
We advise to stop marketing to clients who haven’t been in your salon in over 3 years. In fact, Phorest Salon Software will not allow you to market to clients who haven’t visited your salon in over 3 years – the system will automatically remove their marketing consent. You can always have them opt back in with our digital consultation forms when they visit the salon next. This way, you’ll be getting their consent in a fully GDPR compliant way.