> ## Documentation Index
> Fetch the complete documentation index at: https://docs.usesend.com/llms.txt
> Use this file to discover all available pages before exploring further.

# SMTP support

> A guide to integrate useSend with SMTP

## Prerequisites

You will need an API key and a verified domain to get the most out of this guide:

* [API Key](https://app.usesend.com/dev-settings/api-keys)
* [Verified Domain](https://app.usesend.com/domains)

## SMTP credentials

To set up your SMTP integration, you'll need to provide the following credentials:

* **Host:** `smtp.usesend.com`
* **Port:** `465`, `587`, `2465`, or `2587`
* **Username:** `usesend`
* **Password:** `YOUR-API-KEY`

## Example with Nodemailer

Following example with Nodemailer shows how you can send mails with SMTP support from useSend and Nodemailer.

```javascript theme={null}
const nodemailer = require("nodemailer");

const transporter = nodemailer.createTransport({
  host: "smtp.usesend.com",
  port: 465,
  secure: false,
  auth: {
    user: "usesend",
    pass: "us_123",
  },
  tls: {
    rejectUnauthorized: false,
  },
});

const mailOptions = {
  to: "sender@example.com",
  from: "hello@example.com",
  subject: "Testing SMTP",
  html: "<strong>THIS IS USING SMTP,</strong><p>useSend is the best open source sending platform<p><p>check out <a href='https://usesend.com'>usesend.com</a>",
  text: "hello,\n\nuseSend is the best open source sending platform",
};

transporter.sendMail(mailOptions, (error, info) => {
  if (error) {
    console.error("Error sending email:", error);
  } else {
    console.log("Email sent successfully:", info.response);
  }
});
```