If you have a Google account, you can save this code to your Google Drive.
Google will ask you to confirm Google Drive access.
Save file as:
If you have saved a file to Google Drive, you can open it here:
Click the "Try it" button to allow multiple values (emails) for the email field on form submission.
Tip: Try to type in more than one email before and after you have clicked on the "Try it" button. Separate each email with a comma, like: firstname.lastname@example.org, email@example.com.