Syntax Email Validation API

import java.net.http.*;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

@Service
public class EmailValidationService {

    private final HttpClient http = HttpClient.newHttpClient();
    private final ObjectMapper mapper = new ObjectMapper();
    private final String apiKey = System.getenv("MAILBEAM_KEY");

    public ValidationResult validate(String email) throws Exception {
        String body = mapper.writeValueAsString(Map.of("email", email));

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

        HttpResponse<String> resp = http.send(req, HttpResponse.BodyHandlers.ofString());
        JsonNode result = mapper.readTree(resp.body());

        if (!result.get("syntax_check").asBoolean()) {
            String suggestion = result.has("suggestion") && !result.get("suggestion").isNull()
                ? result.get("suggestion").asText() : null;
            throw new InvalidEmailException("Invalid email format.", suggestion);
        }

        return new ValidationResult(
            result.get("valid").asBoolean(),
            result.get("score").asInt(),
            result.get("normalized_email").asText()
        );
    }
}