Respondent's email addresses can be displayed with the help of Zoho CRM integration. However, the integration is possible only in our Pro and Enterprise plans. To view the respondent's email addresses in the future, please upgrade your survey account to the Pro plan. If you upgrade to the Pro plan, the reports will display the respondent's email addresses for all the future responses. However, it is not possible to display the email addresses for the already received responses for which the email address was not available. This can also happen if you use custom variables in your trial version. The respondents' email addresses will be captured only if the survey account is on the Pro/Enterprise plan. The custom variable must be appended to the survey URL while answering it. If the survey is answered without appending the custom variable, the respondent's email address would be marked as skipped.