Nodemailer is an easy to use module to send e-mails with Node.JS (using SMTP or sendmail).

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(). Nodemailers API is designed after Google App Engines Mail Python API.

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

• Unicode to use any characters
• HTML content as well as plain text alternative
• Attachments
• Embedded images in HTML
• SSL/TLS for secure e-mail delivery

Install through NPM

npm install nodemailer

or download ZIP archive.

The source for Nodemailer is available at GitHub.

NB! If you are using the source and not the automagic of NPM, then you also need to install following dependencies:

• mimelib
• node-iconv

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.SMTP = {
    host: 'smtp.example.com'
}

nodemailer.send_mail({
    sender: '[email protected]',
    to:'[email protected]',
    subject:'Hello!',
    body:'Hi, how are you doing?'
},
function(error, success){
    console.log('Message ' + success ? 'sent' : 'failed');
});

Using EmailMessage

var nodemailer = require('nodemailer');

nodemailer.SMTP = {
    host: 'smtp.example.com'
}

var mail = nodemailer.EmailMessage({
    sender: '[email protected]',
    to:'[email protected]'
});
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: 'smtp.example.com', // required
    port: 25, // optional, defaults to 25 or 465
    use_authentication: false,
    user: '',
    pass: ''
}

Or alternatively if you don't want to use SMTP but the sendmail command then you could set property sendmail to true or as the path to sendmail.

nodemailer.sendmail = true;

or

nodemailer.sendmail = '/path/to/sendmail';

If sendmail is set, then SMTP options are disregarded.

See examples/example.js for a complete example.

If you want to use SSL (not TLS/STARTTLS, just SSL), you need to set the ssl parameter to true.

nodemailer.SMTP = {
    host: 'smtp.gmail.com',
    port: 465,
    ssl: true,
    use_authentication: true,
    user: '[email protected]',
    pass: 'my.password'
}

If you want to use TLS/STARTTLS (port 587), leave ssl to false or do not set it, encryption will be started automatically when needed.

nodemailer.SMTP = {
    host: 'smtp.gmail.com',
    port: 587,
    ssl: false,
    use_authentication: true,
    user: '[email protected]',
    pass: 'my.password'
}

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 plain [email protected] or formatted Sender Name <[email protected]>
• 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 = {
    sender:'[email protected]',
    to:'[email protected]',
    ....
    headers: {
        'X-My-Custom-Header-Value': 'Visit www.example.com for more info!'
    }
}

For debugging set debug to true - then all the data passed between the client and the server will be output to console.

All the e-mail addresses can be plain e-mail address

[email protected]

or with formatted name (includes unicode support)

'Ноде Майлер' <[email protected]>

To, Cc and Bcc fields accept comma separated list of e-mails. Formatting can be mixed.

[email protected], 'Ноде Майлер' <[email protected]>, User Name <[email protected]>

Currently you can't use comma in a formatted name, even if the name is in quotes.

Message body in HTML format can be set with the message field html. If property html has contents but plain text alternative body has not (is left to empty), then existing text from the html version is also used in the plaintext version (without the html formatting).

The charset for html is UTF-8.

nodemailer.send_mail({
    ...
    html: '<p>hello world!<br/>хелло ворлд!</p>'
});

An e-mail message can include one or several attachments. Attachments can be set with the message field attachments which accepts a list of attachment objects.

An attachment object primarly consists of two properties - filename which is the name of the file (not a filepath to an actual file on disk etc.) that will be reported to the receiver as the attachments name; and contents to hold the data in a String or Buffer format. There's an additional property cid which can be used for embedding images in a HTML message.

Property filename is unicode safe.

var attachment_list = [
    {
        'filename': 'attachment1.txt',
        'contents': 'contents for attachment1.txt'
    },
    {
        'filename': 'аттачмент2.bin',
        'contents': new Buffer('binary contents', 'binary');
    }
];

nodemailer.send_mail({
    ...
    attachments: attachment_list
});

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

Use Nodemailer Issue tracker to report additional shortcomings, bugs, feature requests etc.

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 one large string before sending.

See Nodemailer/contributors for a live list

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