On some occasions, event organizer would like to apply a tighter control on their attendee registration list, like avoiding competitors from joining their event or prefer the attendee to register by their company email. You can now make use of the Blocklist function to block email domain(s) or email address(es) to avoid someone from registering your event.
Step 2: To add a list of specific emails or domain, Click on +Block Emails/Domains button
The added emails or domains will appear in the list under the specific tab-- Email Addresses or Email Domains
When blocked attendees try to join the event, they will see the message 'Restricted from entering the event' as shown below.