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All email statistics for the survey are present under Login » Surveys » Send » Email » Lists.
Please note that the latest email statistics will only be updated when you log out and log back in.
You can click on the Number Links in the corresponding columns to view the email addresses under that particular column for an Email list.
Under the Send Survey tab the statistics are captured only for the email lists present. However, under the Reports tab all statistics are captured including test responses, duplicate / multiple responses, Surveys completed using the URL, etc. Therefore the statistics may not match up.
This feature/tools described here are available with the following license(s) :
Professional Edition and above- Buy Now - $15/Month