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Nodemailer is a popular Node.js module which allows you to easily send emails. In this guide, you’ll learn how to set it up with Plunk’s SMTP settings.

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Prerequisites

Before we begin, we’ll need to install nodemailer, and store sensitive values inside a .env file.

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Install Nodemailer

npm i nodemailer

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Install Nodemailer types (Optional)

If you’re using TypeScript in your project, make sure to download @types/nodemailer as well: 
npm i @types/nodemailer --save-dev

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Setup environment varaibles

It is best practise to store sensitive values inside an .env file, add the following values to your env file:
.env
SMTP_PASSWORD=your-secret-api-key

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Sending Transactional emails

Now our project is setup, we can send transactional emails using Nodemailer. First, we need to setup the transporter which holds the connection information and decide what secure method to use:

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Using STARTTLS

To use STARTTLS, set your port to 587 and set secure to false: 
const transporter = createTransport({
	host: "smtp.useplunk.com",
	secure: false,
	port: 587,
	auth: {
		user: "plunk",
		pass: process.env.SMTP_PASSWORD
	}
});

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Using SSL

To use SSL, set your port to 465 and set secure to true: 
const transporter = createTransport({
	host: "smtp.useplunk.com",
	secure: true,
	port: 465,
	auth: {
		user: "plunk",
		pass: process.env.SMTP_PASSWORD
	}
});

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Sending mail!

Now that the transporter has been initalised, we can send some mail! 
const info = await transporter.sendMail({
	from: "hello@example.com",
	to: "hello@example.com",
	subject: "Plunk is awesome!",
	html: "Check it out at https://useplunk.com"
});

await transporter.sendMail(info).catch((err) => {
	console.error(err);
});
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