Translations:Email templates/118/en
From LimeSurvey Manual
If closed-access mode is enabled (there is a survey participants table, which means that only those participants who have an allocated entry and a unique token code associated to it can complete the respective survey. If you allow participants to publicly register to your survey, a new entry in your survey participants table will be created once the respondent has submitted his or her name and email address. A script that runs in the background will automatically send the respective respondent a registration email. It contains the URL with the token that needs to be accessed by the newly registered user.