nodemailer-mailgun-transport

What is this?

nodemailer is an amazing node module to send emails within any of your nodejs apps. This is the transport plugin that goes with nodemailer to send email using Mailgun's awesomeness! Pow Pow.

How does it work?

Based on this mailgun-js module and the nodemailer module, the Mailgun Transport was born. This is a transport layer, meaning it will allow you to send emails using nodemailer, using the Mailgun API instead of the SMTP protocol!

Nodemailer allows you to write code once and then swap out the transport so you can use different accounts on different providers. On top of that it's a super solid way of sending emails quickly on your node app(s).

The Mailgun transport for nodemailer is great to use when SMTP is blocked on your server or you just prefer the reliability of the web api!

Quickstart - Example

Create a new file, install the dependencies [1] and look at the skeleton code below to get you started quickly!

import nodemailer from 'nodemailer';
import mg from 'nodemailer-mailgun-transport-esm';

// This is your API key that you retrieve from www.mailgun.com/cp (free up to 10K monthly emails)
const auth = {
  auth: {
    api_key: 'key-1234123412341234',
    domain: 'one of your domain names listed at your https://app.mailgun.com/app/sending/domains'
  }
}

const nodemailerMailgun = nodemailer.createTransport(mg(auth));

nodemailerMailgun.sendMail({
  from: '[email protected]',
  to: '[email protected]', // An array if you have multiple recipients.
  cc:'[email protected]',
  bcc:'[email protected]',
  subject: 'Hey you, awesome!',
  'replyTo': '[email protected]',
  //You can use "html:" to send HTML email content. It's magic!
  html: '<b>Wow Big powerful letters</b>',
  //You can use "text:" to send plain-text content. It's oldschool!
  text: 'Mailgun rocks, pow pow!'
}, (err, info) => {
  if (err) {
    console.log(`Error: ${err}`);
  }
  else {
    console.log(`Response: ${info}`);
  }
});

Buffer support

Example:

const mailOptions = {
    ...
    attachments: [
        {
            filename: 'text2.txt',
            content: new Buffer('hello world!','utf-8')
        },

with encoded string as attachment content:

const mailOptions = {
    ...
    attachments: [
        {
            filename: 'text1.txt',
            content: 'aGVsbG8gd29ybGQh',
            encoding: 'base64'
        },

with encoded string as an inline attachment:

// Replace `filename` with `cid`
const mailOptions = {
    ...
    attachments: [
        {
            cid: 'logo.png',
            content: 'aGVsbG8gd29ybGQh',
            encoding: 'base64'
        },

<!-- Reference the `cid` in your email template file -->
<img src="cid:logo.png" alt="logo" />

Address objects

The "from", "to", "cc", and "bcc" fields support an address object or array of address objects. Each "name" and "address" are converted to "name <address>" format. "name" is optional, "address" is required. Missing or null address in object is skipped.

Examples:

 from: {name: 'Sales', address: '[email protected]'},
 to: [{name:'Mary', address:'[email protected]'}, {address:'[email protected]'}]

is converted to:

  from: 'Sales <[email protected]>',
  to: 'Mary <[email protected]>,[email protected]'

Now with Consolidate.js templates, and also compatible with mailgun's own templates

This package has two options for templating - one is to allow mailgun's templating engine to process the template, and the other is to use templates in your own codebase using any templating engine supported by consolidate.js.

To use mailgun's templating engine (and allow templates to iterate independent of your codebase), simply pass the template name to the template key, and the template variables as a stringified JSON to the h:X-Mailgun-Variables key. Here's an example: 

nodemailerMailgun.sendMail({
  from: '[email protected]',
  to: '[email protected]', // An array if you have multiple recipients.
  subject: 'Hey you, awesome!',
  template: 'boss_door',
  'h:X-Mailgun-Variables': JSON.stringify({key:'boss'})
}, (err, info) => {
  if (err) {
    console.log(`Error: ${err}`);
  }
  else {
    console.log(`Response: ${info}`);
  }
});

To use consolidate.js templates locally, give the template key an object instead that contains a name key, an engine key and, optionally, a context object. For example, you can use Handlebars templates to generate the HTML for your message like so:

const contextObject = {
  variable1: 'value1',
  variable2: 'value2'
};

nodemailerMailgun.sendMail({
  from: '[email protected]',
  to: '[email protected]', // An array if you have multiple recipients.
  subject: 'Hey you, awesome!',
  template: {
    name: 'email.hbs',
    engine: 'handlebars',
    context: contextObject
  }
}, (err, info) => {
  if (err) {
    console.log(`Error: ${err}`);
  }
  else {
    console.log(`Response: ${info}`);
  }
});

You can use any of the templating engines supported by Consolidate.js. Just require the engine module in your script, and pass a string of the engine name to the template object. Please see the Consolidate.js documentation for supported engines.

Mailgun Regions

You can use two different region environments for your mailgun domains. For USA region you should use api endpoint api.mailgun.net, but for EU region api.eu.mailgun.net

You can pass it as "host" to transport options object:

import nodemailer from 'nodemailer';
import mg from 'nodemailer-mailgun-transport-esm';

const options = {
  auth: {
    api_key: 'key-1234123412341234',
    domain: 'one of your domain names listed at your https://mailgun.com/app/domains'
  },
  host: 'api.eu.mailgun.net' // e.g. for EU region
}

const nodemailerMailgun = nodemailer.createTransport(mg(auth));

[1] Quickly install dependencies

npm install --save nodemailer nodemailer-mailgun-transport-esm