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Is there a possibility to block certain email addresses from creating appointments? Ideally by using wildcards, e.g. a mask like *@gmail.com that will exclude all Gmail addresses.
I know that you can set such blacklists directly on the SMPT server, but doing so will cause the Booking Calendar plugin to show an error message like “Unable to relay recipient in non-accepted domain”, but on the admin side, the appointment will be created regardless.
Is it possible for the plugin to automatically deny an appointment if such an error occurs?
Thank you very much in advance.