Security

Someone keeps using the email address of one of our employees to create a guest account. Is there any way to prevent them from doing this?

You need to edit the form.  Look for isvalidemail on this page:  https://www.arubanetworks.com/techdocs/ClearPass/6.7/Guest/Default.htm#Reference/FormFieldValidationFunctions.htm

Thanks Colin - I'll see if I can figure out how that works.

Here is a knowledgebase article about it:

http://community.arubanetworks.com/t5/AAA-NAC-Guest-Access-BYOD/Email-validator-to-allow-disallow-certain-domains/ta-p/174468

You need to edit the form.  Look for isvalidemail on this page:  https://www.arubanetworks.com/techdocs/ClearPass/6.7/Guest/Default.htm#Reference/FormFieldValidationFunctions.htm