The responses of the form designed in the email template get stored in the submission tab of the analytics dashboard for every campaign.

Here are the steps to navigate to the 'submissions' section of a campaign.

Step 1: Once you send a campaign, you get redirected to the campaign dashboard. 
If you wish to visit this page in the future, click on campaigns->select desired campaign.

Step 2: In the campaign dashboard, you can check the total number of submissions in a template.

If you wish to check each response, you can
check the 'Submissions' tab present in the top menu.

Step 3: In order to check the overall insights of the form submissions in percentages and bar graphs, you can check the 'Insights' section.