Send Emails with Java

// No external dependencies — uses Java 11+ HttpClient

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

HttpClient client = HttpClient.newHttpClient();
String apiKey = "sk_live_...";

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 apiKey = System.getenv("POSTSTACK_API_KEY");

        String json = """
            {
                "from": "hello@yourdomain.com",
                "to": "user@example.com",
                "subject": "Hello from Java!",
                "html": "<h1>Welcome!</h1>"
            }
            """;

        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://api.poststack.dev/v1/emails"))
            .header("Authorization", "Bearer " + apiKey)
            .header("Content-Type", "application/json")
            .POST(HttpRequest.BodyPublishers.ofString(json))
            .build();

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

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