Email integration with PEC and MAILGUN services using api call.

src/main/java/net/gepafin/tendermanagement/service/impl/MailgunEmailService.java

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+package net.gepafin.tendermanagement.service.impl;
+
+import net.gepafin.tendermanagement.model.request.EmailConfig;
+import net.gepafin.tendermanagement.service.feignClient.MailgunFeignClient;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Service;
+
+import java.util.Base64;
+import java.util.List;
+
+@Service
+public class MailgunEmailService implements EmailService {
+
+    @Autowired
+    private MailgunFeignClient mailgunFeignClient;
+
+    @Override
+    public void sendEmail(String subject, String body, List<String> recipientEmails, EmailConfig emailConfig) {
+        String domain = emailConfig.getDomain();
+        String from = emailConfig.getSender();
+        String apiKey = emailConfig.getApiKey();
+        String authHeader = "Basic " + Base64.getEncoder().encodeToString(("api:" + apiKey).getBytes());
+
+        // Send email via Mailgun API
+        ResponseEntity<Void> response = mailgunFeignClient.sendEmail(domain, from, recipientEmails, subject, body, authHeader);
+        if (!response.getStatusCode().is2xxSuccessful()) {
+            throw new RuntimeException("Failed to send email via Mailgun: " + response.getStatusCode());
+        }
+    }
+}
+
+