Simple way to send SMTP mail using Node.js

In this article, you will learn how to send SMTP mail using the Node.js. NodeJS is an open source, cross-platform runtime environment for creating server-side and networking applications. It follows a single thread with an event loop that supports multiple concurrent connections.

SMTP stands for Simple Mail Transfer Protocol. SMTP is a TCP/IP protocol of the Internet standard for electronic mail transmission from one user to another. In this, mail is pushed to the destination mail server, or either POP or IMAP is used to retrieve the mail. For this, we need SMTP server details: SERVICE, USERNAME, and PASSWORD.

These are the step-by-step process to send SMTP mail using Node.js-

Nodemailer is the most popular Node.js email package. It provides functionality for both email creation and email sending. The Nodemailer module can be downloaded and installed using npm.

STEP 1: Install the nodemailer package.

Open the command prompt, go to the directory of your project, and write the following command to install nodemailer.

npm install nodemailer

STEP 2: Include nodemailer

mailer = require('nodemailer');

STEP 3: Set your SMTP mail server credentials

In the above example, smtpProtocol is a mail configuration object and mailer.createTransport() is a transport service that includes mail service, username and password.

smtpProtocol = mailer.createTransport({
    service: "Gmail",
    auth: {
        user: "This email address is being protected from spambots. You need JavaScript enabled to view it.",
        pass: "password"
    }
});

STEP 3: Set your SMTP mail recipient information

The mailoption is another configuration object that contains other details.

• from: Sender email address
• to: Receiver email address
• subject: Subject of the mail
• html: Message body

var mailoption = {
    from: "This email address is being protected from spambots. You need JavaScript enabled to view it.",
    to: "This email address is being protected from spambots. You need JavaScript enabled to view it.",
    subject: "Test Mail",
    html: 'Good Morning!'
}

STEP 4: Send the mail

Finally, the sendMail() function is responsible for sending mail. It contains two parameters- mailoptions object that we had set earlier and a callback function. The callback function will be called when mail is sent to notify the user whether the mail was successfully submitted or if an error was reported.

smtpProtocol.sendMail(mailoption, function(err, response){
    if(err) {
        console.log(err);
    } 
    console.log('Message Sent' + response.message);
    smtpProtocol.close();
});

Complete code: Send SMTP mail using Node.js

mailer = require('nodemailer');

smtpProtocol = mailer.createTransport({
    service: "Gmail",
    auth: {
        user: "This email address is being protected from spambots. You need JavaScript enabled to view it.",
        pass: "password"
    }
});

var mailoption = {
    from: "This email address is being protected from spambots. You need JavaScript enabled to view it.",
    to: "This email address is being protected from spambots. You need JavaScript enabled to view it.",
    subject: "Test Mail",
    html: 'Good Morning!'
}

smtpProtocol.sendMail(mailoption, function(err, response){
    if(err) {
        console.log(err);
    } 
    console.log('Message Sent' + response.message);
    smtpProtocol.close();
});

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