# Deno Deploy

> Send your first email from Deno Deploy by calling the MailBlastr API with fetch.

Send your first email from [Deno Deploy](https://deno.com/deploy) by calling the MailBlastr REST API. The `mailblastr` SDK targets Node.js/npm — Deno users POST JSON to `https://api.mailblastr.com/emails` using the built-in global `fetch`, so there is nothing to install.

## Prerequisites

Before you start, you will need:

- A MailBlastr [API key](https://www.mailblastr.com/docs/api-keys/overview).
- A [verified domain](https://www.mailblastr.com/docs/domains/managing) to send from.

## 1. Create a Deno Deploy project

Go to [dash.deno.com/projects](https://dash.deno.com/projects) and create a new playground project.

## 2. Store your API key

In your project's **Settings → Environment Variables**, add `MAILBLASTR_API_KEY` with your key, then read it with `Deno.env.get`.

**Environment variable**

```sh
MAILBLASTR_API_KEY=mb_xxxxxxxxx
```

## 3. Edit the handler function

Paste the following code into the browser editor.

**main.ts**

```ts
const MAILBLASTR_API_KEY = Deno.env.get('MAILBLASTR_API_KEY');

Deno.serve(async () => {
  try {
    const res = await fetch('https://api.mailblastr.com/emails', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${MAILBLASTR_API_KEY}`,
      },
      body: JSON.stringify({
        from: 'Acme <onboarding@yourdomain.com>',
        to: ['delivered@example.com'],
        subject: 'Hello World',
        html: '<strong>It works!</strong>',
      }),
    });

    const data = await res.json();

    return new Response(JSON.stringify(data), {
      status: res.ok ? 200 : res.status,
      headers: { 'Content-Type': 'application/json' },
    });
  } catch (error) {
    console.error(error);
    return new Response(null, { status: 500 });
  }
});
```

## 4. Deploy and send email

Click **Save & Deploy** at the top of the screen, then open the deployment URL to verify your email was sent.

> **Note:** See the full set of body fields in the [Send an email](https://www.mailblastr.com/docs/api/emails-send) reference.