> For the complete documentation index, see [llms.txt](https://docs.mailtrap.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mailtrap.io/guides/integrations/aws-lambda.md).

# AWS Lambda

Learn how to integrate Mailtrap with AWS Lambda functions to send emails using the Mailtrap Email API.

## Overview

This guide explains how to integrate Mailtrap with AWS Lambda functions to send emails programmatically using the Mailtrap Email API.

### Prerequisites

Before you start, make sure you have:

* [Verified your sending domain](/email-api-smtp/setup/sending-domain.md)
* [Created and saved an API key](/email-api-smtp/setup/api-tokens.md)

## Send emails using AWS Lambda and Mailtrap

To integrate Mailtrap and send emails via AWS Lambda, copy and paste the following script into your Lambda function:

{% code title="lambda-mailtrap-handler.js" %}

```javascript
/* global fetch */
const MAILTRAP_API_KEY = 'YOUR-MAILTRAP-API-KEY-HERE';

export const handler = async (event) => {
  try {
    const res = await fetch('https://send.api.mailtrap.io/api/send', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${MAILTRAP_API_KEY}`
      },
      body: JSON.stringify({
        from: { name: 'Mailtrap Test', email: 'YOUR-EMAIL-HERE' },
        to: [{ email: 'RECIPIENT-EMAIL-HERE' }],
        subject: 'Hello World',
        html: '<strong>it works!</strong>',
      })
    });

    if (res.ok) {
      const data = await res.json();

      return {
        statusCode: 200,
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify(data),
      };
    }

    return {
      statusCode: 400,
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({ error: `HTTP ${res.status}` }),
    };
  } catch (error) {
    return {
      statusCode: 500,
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        error: error instanceof Error ? error.message : 'Unknown error'
      }),
    };
  }
};
```

{% endcode %}

### Configuration

Once you copy the script, update the following fields with your information:

* Replace `YOUR-MAILTRAP-API-KEY-HERE` in the `MAILTRAP_API_KEY` constant with your actual API token
* Replace `YOUR-EMAIL-HERE` with your verified sender email
* Replace `RECIPIENT-EMAIL-HERE` with the recipient's email address

### Learn more

For additional details about the Email API, refer to the [Mailtrap Email Sending API Integration guide](/email-api-smtp/setup/api-integration.md).


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.mailtrap.io/guides/integrations/aws-lambda.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.