perlQuestionnaire allows you to choose between two methods of sending email when you wish to use "Email Verification" as a Survey User Restriction. Instead of a SMTP Server you may choose to use a Sendmail Path. If neither of these items is completed, you will not be able to use Email Verification.

The SMTP Server is a domain name that you will be allowed to send email messages through. You must also have installed the Net::SMTP module in order for this to work. If you are unsure of your SMTP Server name, please contact your server administrator to see if you have access to one.

If you do not have access to an SMTP Server or the Net::SMTP module, please look into using a Sendmail Path.