The add-ons has been enhanced to have better eVoting passcode email formatting.
The Add-on has been tested with Non-Profit GSuite account for voting participants limit of 1000. Confirm your Google account type, limitation and Quotas here.
Google Form, a free online voting/polling or survey comes in handy when you are working on your stuff but it does have limitation when it comes to confidential voting. You couldn't control who could vote on your Google Form when you are publishing your Google Form in public or within your organization. In other words, anyone in your organization could fill-in your Google Form once they obtained the link. When it comes to confidential or anonymous voting, you couldn't collect email address or any sorts of personal details that will expose personal choice. This leads to unknown validity of voting whether if is there double voting (known bug in Google Form although limit to 1 responses is set) or voting by person who are not authorized.
Gmail - To send passcode to the email lists and to permanently delete the sent passcode email to protect the confidentiality of voting.
Google Form - To manage your Form by adding the Passcode question (with validation) and section header.
Google Sheet - To create the linked Google Sheet for you to list down the email address that you have authorized to vote.
Google UI - To display error message and also open our Support Website/Linked Google Sheet.
Google App Script API - to install the code to your Google Form