Under the blacklist section you can enable that when a blacklisted visitor tries to check in, a call for help button is enable that when clicked, sends an email to the specified recipient containing the name(s) and location(s) of the blacklisted visitor(s).
You have the option to change the email subject for the blacklist emails as well as sending a test email to the specified sender and editing the email message.
An overview of the email editor can be found here.
