nodemailer.createTestAccount((err, account) => {
  let transporter = nodemailer.createTransport({
    service: "gmail",
    auth: {
      user: "test@gmail.com",
      pass: "123456"
    }
  });

  let mails = [
    {
      name: "Tom",
      email: "test1@gmail.com"
    },
    {
      name: "Tom",
      email: "test1@gmail.com"
    }
  ]

  let go = () => {
    for (const mail of mails) {
      let setting = {
        from: "test@gmail.com",
        to: mail.email,
        subject: "Title",
        text: ` Hi, ${mail.name}`
      };
    }
  };

  transporter.sendMail(go, (error, response) => {
    if (error) {
      return console.log(error);
    }
    console.log(response);
  });
});