Java

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

public class SendEmail {
  public static void main(String[] args) throws Exception {
    String body = """
      {
        "subject": "Hello from Mailtarget",
        "from": { "email": "you@your-verified-domain.com", "name": "Your Name" },
        "to": [{ "email": "recipient@example.com" }],
        "bodyText": "If you can read this, the integration works."
      }
      """;

    HttpRequest request = HttpRequest.newBuilder()
      .uri(URI.create("https://transmission.mailtarget.co/v1/layang/transmissions"))
      .header("Authorization", "Bearer " + System.getenv("MAILTARGET_API_KEY"))
      .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());
  }
}