not allow the registration of a specific email

Hello, is it possible to "block" some email addresses in particular so that they cannot register for events?
I did not find the option in the configurations, perhaps it can be done from the e-mail field in the Validation Rules part, but I do not know what I would have to write as a sentence for it, it is possible that someone can help me write Validation Rules so as not to allow specific email addresses in the "email" field of the registratio

Hello

The extension does not support this option. So if you really need it, some custom development will be needed and it will cost you 50$ for the development

If you are interested with this development, please submit a support ticket so that we can discuss more details about it

Regards,

Tuan

I would have to consult with my client, in the case of developing the solution, it would be possible that the configuration is that it automatically does not allow the registration of mails with X amount of chech in in the registered base to all events (the logic is that given that they are similar events we need that a person cannot “attend” more than X events) (it would be necessary for the count to be on those registered with associated chekin so as not to block someone who registered several times but did not actually attend)