Code cleaning.

src/main/java/fr/ippon/example/intellijfeatures/controller/EmailController.java

@@ -2,21 +2,21 @@ package fr.ippon.example.intellijfeatures.controller;
 
 import fr.ippon.example.intellijfeatures.model.User;
 import fr.ippon.example.intellijfeatures.services.mail.EmailService;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
+
+import static org.springframework.http.HttpStatus.NO_CONTENT;
 
 @RestController
 @RequestMapping("/api/mails")
-public class MailController {
+public class EmailController {
     private final EmailService emailService;
 
-    public MailController(EmailService emailService) {
+    public EmailController(EmailService emailService) {
         this.emailService = emailService;
     }
 
     @PostMapping("/send")
+    @ResponseStatus(NO_CONTENT)
     public void sendMail(@RequestBody User user) {
         emailService.sendMail(user);
     }

src/main/java/fr/ippon/example/intellijfeatures/services/mail/EmailSender.java

@@ -2,13 +2,13 @@ package fr.ippon.example.intellijfeatures.services.mail;
 
 import org.springframework.mail.javamail.JavaMailSender;
 import org.springframework.mail.javamail.MimeMessageHelper;
-import org.springframework.stereotype.Service;
+import org.springframework.stereotype.Component;
 
 import javax.mail.MessagingException;
 import javax.mail.internet.MimeMessage;
 
-@Service
-public class EmailSender {
+@Component
+class EmailSender {
     private final JavaMailSender javaMailSender;
 
     public EmailSender(JavaMailSender javaMailSender) {