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Easy to use module to send e-mails with Node.JS
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Nodemailer is an easy to use module to send e-mails with Node.JS.

You can use two ways to send an e-mail message: the EmailMessage constructor or the shortcut function send_mail(). The send_mail() function takes all the fields of the e-mail message as a function parameter and sends the e-mail immediately. EmailMessage allows to compose the message object first and send it later with its method send().

Nodemailer is Unicode friendly ✔. You can use any characters you like.


Install through NPM

npm install nodemailer

or download ZIP archive.

If you use NPM then the module is available as var nodemailer = require('nodemailer'); but if you're using the source then var nodemailer = require('./path_to_nodemailer/lib/mail');


Using send_mail()

var nodemailer = require("nodemailer");

nodemailer.send_mail({sender: "", 
                      body:"Hi, how are you doing?"},
                      function(error, success){
                          console.log("Message "+(success?"sent":"failed"));

Using EmailMessage

var nodemailer = require("nodemailer");

var mail = nodemailer.EmailMessage({
                      sender: "", 
mail.subject = "Hello!";
mail.body = "Hi, how are you doing?";

mail.send(function(error, success){
              console.log("Message "+(success?"sent":"failed"));

The callback function gets two parameters - error and success. If there's an error, then sending failed and you should check where's the problem. If there's no error value but success is not true then the server wasn't able to process the message correctly. Probably there was timeout while processing the message etc - in this case you should re-schedule sending this e-mail. If success is true then the message was sent successfully.


Before sending e-mails you need to set up SMTP server parameters.

nodemailer.SMTP = {
    host: "",
    port: 25,
    hostname: "",
    use_authentication: false,
    user: "",
    pass: ""

See examples/example.js for a complete example.

Email Message Fields

The following are the possible fields of an e-mail message:

  • sender - The e-mail address of the sender. All e-mail addresses can be as or formatted Sender Name <>
  • to - Comma separated list of recipients e-mail addresses that will appear on the To: field
  • cc - Comma separated list of recipients e-mail addresses that will appear on the Cc: field
  • bcc - Comma separated list of recipients e-mail addresses that will appear on the Bcc: field
  • reply_to - An e-mail address that will appear on the Reply-To: field
  • subject - The subject of the e-mail
  • body - The plaintext version of the message
  • html - The HTML version of the message
  • attachments - An array of attachment objects. Attachment object consists of two properties - filename and contents. Property contents can either be a String or a Buffer (for binary data). filename is the name of the attachment.

There's an optional extra field headers which holds custom header values in the form of {key: value}. These values will not overwrite any existing header but will be appended to the list.

mail_data = {
    headers: {
        'X-My-Custom-Header-Value': 'Visit for more info!'

Using Embedded Images

Attachments can be used as embedded images in the HTML body. To use this feature, you need to set additional property of the attachment - cid (unique identifier of the file) which is a reference to the attachment file. The same cid value must be used as the image URL in HTML (using cid: as the URL protocol, see example below).

NB! the cid value should be as unique as possible!

var cid_value =".image.jpg";
var html = 'Embedded image: <img src="cid:'+cid_value+'" />';
var attachments = [{
    filename: "image.png",
    contents: IMAGE_CONTENTS,
    cid: cid_value



Node.JS v0.3.x doesn't support changing to a secure channel in the middle of a connection (STARTTLS). So when a server requires authentication and this must be done over TLS it's a problem.


Currently the only allowed charset is UTF-8.


Do not use large attachments as the attachment contents are read into memory and the final message body is combined into a single string.


Nodemailer is licensed under MIT compatible license. Basically you can do whatever you want to with it.

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