@longnc/themartec-smtpapi/examples/example.js

Build SendGrid X-SMTPAPI headers in nodejs. And this version for upgrade some packages to latest and fix security

var smtpapi = require('../lib/main.js')
var nodemailer = require('nodemailer');
var header    = new smtpapi();

// addTo
header.addTo('test1@example.com');
header.addTo('test2@example.com');

// setTos
//header.setTos(['you@youremail.com', 'other@otheremail.com');

// addSubstitution
header.addSubstitution('keep', ['secret']);
header.addSubstitution('other', ['one', 'two']);

// setSubstitutions
//header.setSubstitutions({'keep': ['secret'], 'other': ['one', 'two']});

// addUniqueArg
header.addUniqueArg('cat', 'dogs');

// setUniqueArgs
//header.setUniqueArgs({cow: 'chicken'});
//header.setUniqueArgs({dad: 'proud'});

// addCategory
header.addCategory('tactics');
header.addCategory('advanced');

// setCategories
//header.setCategories(['tactics', 'advanced']);

// addSection
header.addSection('-charge-', 'This ship is useless.');

// setSections
//header.setSections({'-charge-': 'This ship is useless.', '-other': 'Another section here'});

// addFilter
// You can add filter settings one at a time.
header.addFilter('footer', 'enable', 1);
header.addFilter('footer', 'text/html', '<strong>boo</strong>');

// setFilters
// You can set a filter using an object literal.
/*
header.setFilters({
  'footer': {
    'setting': {
      'enable': 1,
      'text/plain': 'You can haz footers!'
    }
  }
});
*/

// setSendAt
// You can set the send_at scheduling param using an UNIX timestamp.
header.setSendAt(1409348513);

// setBatchId
// You can set the batch_id scheduling param using a string.
header.setBatchId('apples');

// setSendEachAt
// You can set the send_each_at scheduling param using a list of UNIX timestamps.
//header.setSendEachAt([1409348513, 14093485134]);

// addSendEachAt
// You can append one or more send_each_at scheduling param(s) to the existing ones using an UNIX timestamp.
//header.setSendEachAt([1409348511, 14093485132]);
//header.addSendEachAt(1409348513]);
//header.addSendEachAt(14093485134);

// setASMGroupID
// You can set the ASM Group ID.
header.setASMGroupID(123);

// [IP Pools](https://sendgrid.com/docs/API_Reference/Web_API_v3/IP_Management/ip_pools.html)
header.setIpPool("testPool");

// You can verify headers set (for debugging/logging purposes)
console.log(header.jsonString());

// Send usin Nodemailer
var headers    = { 'x-smtpapi': header.jsonString() };

// Use nodemailer to send the email
var settings  = {
  host: "smtp.sendgrid.net",
  port: parseInt(587, 10),
  requiresAuth: true,
  auth: {
    user: process.env.SENDGRID_USERNAME,
    pass: process.env.SENDGRID_PASSWORD
  }
};
var smtpTransport = nodemailer.createTransport(settings);

var mailOptions = {
  from:     "Example User <test@examplecom>",
  to:       "test@example.com",
  subject:  "Hello",
  text:     "Hello world",
  html:     "<b>Hello world</b>",
  headers:  headers
}

smtpTransport.sendMail(mailOptions, function(error, response) {
  smtpTransport.close();

  if (error) {
    console.log(error);
  } else {
    console.log("Message sent");
  }
});