# Java

> Send your first email from Java using the built-in HttpClient against the MailBlastr API.

MailBlastr has no Java SDK — you send email by POSTing JSON to `https://api.mailblastr.com/emails`. The example below uses the `java.net.http.HttpClient` introduced in Java 11, so no dependencies are required.

## Prerequisites

- 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.
- Java 11 or newer (for the built-in `HttpClient`).

## 1. Set your API key

**.env**

```sh
MAILBLASTR_API_KEY=mb_xxxxxxxxx
```

## 2. Send emails using HTML

**Main.java**

```java
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Main {
    public static void main(String[] args) throws Exception {
        String apiKey = System.getenv("MAILBLASTR_API_KEY");

        String body = """
            {
              "from": "Acme <onboarding@yourdomain.com>",
              "to": ["delivered@example.com"],
              "subject": "it works!",
              "html": "<strong>hello world</strong>"
            }
            """;

        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://api.mailblastr.com/emails"))
            .header("Authorization", "Bearer " + apiKey)
            .header("Content-Type", "application/json")
            .POST(HttpRequest.BodyPublishers.ofString(body))
            .build();

        HttpResponse<String> response = HttpClient.newHttpClient()
            .send(request, HttpResponse.BodyHandlers.ofString());

        System.out.println(response.statusCode());
        System.out.println(response.body());
    }
}
```

> **Note:** In Spring Boot, you can use `RestClient` or `WebClient` against the same URL with the same Bearer header. See [Send an email](https://www.mailblastr.com/docs/api/emails-send) for all fields.