Validating email addresses belongs to our domain

Question

I want to use a Google Form to populate a Google Spreadsheet. One of the fields is email address, and I need to validate this against the list of emails for our organisation - in other words forcing people to use valid and existing email addresses.

Our organisation uses Google Apps. The form will be created by a user who is in our organisation and only email addresses from our organisation/domain will be considered valid.

Answer 1

You can use the experimental Apps Script Domain Services API. Here's how I'd do it.

function isValidEmailInMyDomain(address) {
  var parts = address.split('@');
  if( parts.length != 2 )
    return false;
  if( parts[1] != UserManager.getDomain() )
    return false;
  try {
    UserManager.getUser(parts[0]);
    return true;
  } catch(doesNotExist) {
    return false;
  }
}

function testFunction() { //check the menu View > Logs
  Logger.log(isValidEmailInMyDomain('aEmailIn@yourDomain.com'));
}