email from google sheet script

email_from_sheet.js

// https://developers.google.com/apps-script/articles/sending_emails
var EMAIL_SENT = "EMAIL_SENT";

function sendEmails() {
  var body = DocumentApp.openById('1BHx9yBH9zTo27w35B2iSwXzHfn1UWS_KOAIo2OEugsE'); //this is the google doc id for the email body
  var sheet = SpreadsheetApp.getActiveSheet();
  var startRow = 2;  // First row of data to process
  var numRows = 25;   // Number of rows to process
  // Fetch the range of cells A2:B3
  var dataRange = sheet.getRange(startRow, 1, numRows, 3)
  // Fetch values for each row in the Range.
  var data = dataRange.getValues();
  for (var i = 0; i < data.length; ++i) {
    var row = data[i];
    var fullName = row[0];
    var emailAddress = row[1];  // First column
    var message = body;         // Second column
    var emailSent = row[4];     // Third column
    if (emailSent != EMAIL_SENT) {  // Prevents sending duplicates
      var subject = "Please Add An Event Apart to your UX Event List"; //subject body
      MailApp.sendEmail(emailAddress, subject, message);
      sheet.getRange(startRow + i, 5).setValue(EMAIL_SENT);
      // Make sure the cell is updated right away in case the script is interrupted
      SpreadsheetApp.flush();
    }
  }
}