Only people with an email adress that is part of one or more given domain(s) (e.g. ***@bigmarker.com) can register for the webinar. This is very important for more confidential webinars. Something like this: {if [EnteredDomainName] = "ListedDomain1" or "ListedDomain2" ..etc; RegistrationAllowed = true Else RegistrationAllowed = False Prompt: "Sorry, you can't register for this webinar"} OR Registration is blocked when the email domain name is part of one or more given domain name(s). like {if [EnteredDomainName] = "ListedDomain1" or "ListedDomain2" ..etc; RegistrationAllowed = False Prompt: "Sorry, you can't register for this webinar" Else RegistrationAllowed = True }