Email messages sending module has multiple of advanced options which allow to set settings for controlled sending of email messages which restricts emails from being sent to spam boxes on email servers or blocked totally by spam filters.
System allows user management which within it's solutions has grouping functionality. Thatnks to this feature surveys or simple newsletter can be sent to specific groups like people from the same city or to send emails to multiple language groups.
Administrator after each filled survey get's report about it. System additionally displays whole statistic of all surveys which allows user to analyze their previous surveys or tests. This way you can keep high quality of your surveys.