old_contents: 'use strict'
  const mailer = require('./docuSignMailer.js');
  module.exports = {
      massMailer: function(req, res) {
          const emailList = req.body.emailList;
          const docuSignEmail = req.body.docuSignEmail;
          const docuSignPass = req.body.docuSignPass;
          const volunteerInfo = req.body.volunteerInfo;
          const templateInfo = req.body.templateInfo;
          emailList.forEach(function(volunteer) {
              mailer(docuSignEmail, docuSignPass, volunteerInfo, templateInfo)
          });
          res.send('Operation complete!');
      }
  };
new_contents: 'use strict'
  const mailer = require('./docuSignMailer.js');
  const async = require('async');
  module.exports = {
      massMailer: function(req, res) {
          const emailList = req.body.emailList;
          const docuSignEmail = req.body.docuSignEmail;
          const docuSignPass = req.body.docuSignPass;
          const volunteerInfo = req.body.volunteerInfo;
          const templateInfo = req.body.templateInfo;
          async.eachSeries(emailList, function(item) {
              mailer(docuSignEmail, docuSignPass, volunteerInfo, templateInfo);
          });
          res.send('Operation Complete');
      }
  };
subject: fix async