SalonLife doesn’t offer a way to block a specific contact, and it likely wouldn’t be very useful anyway, since a malicious person could simply keep creating new bookings under fake names and contact details.

However, an alternative is to add a passcode to your online booking, so that only clients you’ve shared the passcode with can book an appointment with you. You can add an online booking passcode from Apps -> Staff -> Your Profile -> Settings -> Online Booking Passcode.

You’ll find detailed instructions on this page.

Adding a passcode is a good solution when your client base is mostly full and there’s no room for new clients.

You can also privately notify your client base about the new passcode by sending a newsletter through Mailchimp.

This page has detailed instructions on how to send a mass email.