diff --git a/src/Controller/SecurityController.php b/src/Controller/SecurityController.php
index 7cbfced..cf42030 100644
--- a/src/Controller/SecurityController.php
+++ b/src/Controller/SecurityController.php
@@ -15,16 +15,17 @@ use App\Form\ForgotPasswordFormType;
 use App\Form\RegistrationFormType;
 use App\Form\ResetPasswordFormType;
 use App\Repository\UserRepository;
+use App\Service\Email\SendActivationEmailService;
+use App\Service\Email\SendPasswordResetEmailService;
+use App\Service\Email\SendUserActivationNotificationService;
+use App\Service\Email\SendUserRegistrationNotificationService;
 use DateTime;
 use Doctrine\ORM\EntityManagerInterface;
 use LogicException;
-use Symfony\Bridge\Twig\Mime\TemplatedEmail;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
-use Symfony\Component\DependencyInjection\Attribute\Autowire;
-use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Attribute\AsController;
-use Symfony\Component\Mailer\MailerInterface;
 use Symfony\Component\PasswordHasher\Hasher\UserPasswordHasherInterface;
 use Symfony\Component\Routing\Attribute\Route;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
@@ -44,21 +45,28 @@ use Symfony\Component\Security\Http\Authentication\AuthenticationUtils;
 class SecurityController extends AbstractController
 {
     public function __construct(
-        #[Autowire(env: 'APP_CONTACT_MAIL_ADDRESS')]
-        private readonly string $appContactMailAddress,
+        private readonly EntityManagerInterface                  $em,
+        private readonly RequestStack                            $requestStack,
+        private readonly UserRepository                          $userRepository,
+        private readonly UserPasswordHasherInterface             $passwordHasher,
+        private readonly AuthenticationUtils                     $authenticationUtils,
+        private readonly SendActivationEmailService              $activationEmail,
+        private readonly SendPasswordResetEmailService           $passwordResetEmail,
+        private readonly SendUserActivationNotificationService   $activationNotificationEmail,
+        private readonly SendUserRegistrationNotificationService $registrationNotificationEmail,
     ) {
     }
 
     #[Route('/login', name: 'MineSeekerBundle_login')]
-    public function login(AuthenticationUtils $authenticationUtils): Response
+    public function login(): Response
     {
         if ($this->getUser()) {
             return $this->redirectToRoute('MineSeekerBundle_homepage');
         }
 
         return $this->render('Security/login.html.twig', [
-            'last_username' => $authenticationUtils->getLastUsername(),
-            'error'         => $authenticationUtils->getLastAuthenticationError(),
+            'last_username' => $this->authenticationUtils->getLastUsername(),
+            'error'         => $this->authenticationUtils->getLastAuthenticationError(),
         ]);
     }
 
@@ -69,29 +77,25 @@ class SecurityController extends AbstractController
     }
 
     #[Route('/register', name: 'MineSeekerBundle_register')]
-    public function register(
-        Request                     $request,
-        UserPasswordHasherInterface $hasher,
-        EntityManagerInterface      $em,
-        MailerInterface             $mailer,
-    ): Response {
+    public function register(): Response
+    {
         if ($this->getUser()) {
             return $this->redirectToRoute('MineSeekerBundle_homepage');
         }
 
         $user = new User();
         $form = $this->createForm(RegistrationFormType::class, $user);
-        $form->handleRequest($request);
+        $form->handleRequest($this->requestStack->getCurrentRequest());
 
         if ($form->isSubmitted() && $form->isValid()) {
             $token = bin2hex(random_bytes(32));
 
             $user->isVerified = false;
             $user->verificationToken = $token;
-            $user->password = $hasher->hashPassword($user, $form->get('plainPassword')->getData());
+            $user->password = $this->passwordHasher->hashPassword($user, $form->get('plainPassword')->getData());
 
-            $em->persist($user);
-            $em->flush();
+            $this->em->persist($user);
+            $this->em->flush();
 
             $activationUrl = $this->generateUrl(
                 'MineSeekerBundle_activate',
@@ -104,30 +108,8 @@ class SecurityController extends AbstractController
                 $activationUrl = str_replace('http://', 'https://', $activationUrl);
             }
 
-            $mailer->send(
-                new TemplatedEmail()
-                    ->from('noreply@mineseeker.hu')
-                    ->to($user->email)
-                    ->subject('Activate your MineSeeker account')
-                    ->htmlTemplate('emails/activation.html.twig')
-                    ->context([
-                        'username'       => $user->getUsername(),
-                        'activation_url' => $activationUrl,
-                    ])
-            );
-
-            /** Send admin notification about new user registration */
-            $mailer->send(
-                new TemplatedEmail()
-                    ->from('noreply@mineseeker.hu')
-                    ->to($this->appContactMailAddress)
-                    ->subject('🎉 New User Registration: ' . $user->getUsername())
-                    ->htmlTemplate('emails/user_registration_notification.html.twig')
-                    ->context([
-                        'user'         => $user,
-                        'registeredAt' => new DateTime(),
-                    ])
-            );
+            $this->activationEmail->send($user, $activationUrl);
+            $this->registrationNotificationEmail->send($user, new DateTime());
 
             $this->addFlash('verify_email', $user->email);
 
@@ -138,28 +120,24 @@ class SecurityController extends AbstractController
     }
 
     #[Route('/forgot-password', name: 'MineSeekerBundle_forgot_password')]
-    public function forgotPassword(
-        Request                $request,
-        UserRepository         $userRepository,
-        EntityManagerInterface $em,
-        MailerInterface        $mailer,
-    ): Response {
+    public function forgotPassword(): Response
+    {
         if ($this->getUser()) {
             return $this->redirectToRoute('MineSeekerBundle_homepage');
         }
 
         $form = $this->createForm(ForgotPasswordFormType::class);
-        $form->handleRequest($request);
+        $form->handleRequest($this->requestStack->getCurrentRequest());
 
         if ($form->isSubmitted() && $form->isValid()) {
             $email = $form->get('email')->getData();
-            $user = $userRepository->findOneByEmail($email);
+            $user = $this->userRepository->findOneByEmail($email);
 
             if ($user && $user->isVerified) {
                 $token = bin2hex(random_bytes(32));
                 $user->resetToken = $token;
                 $user->resetTokenExpiresAt = new DateTime('+1 hour');
-                $em->flush();
+                $this->em->flush();
 
                 $resetUrl = $this->generateUrl(
                     'MineSeekerBundle_reset_password',
@@ -172,20 +150,9 @@ class SecurityController extends AbstractController
                     $resetUrl = str_replace('http://', 'https://', $resetUrl);
                 }
 
-                $mailer->send(
-                    new TemplatedEmail()
-                        ->from('noreply@mineseeker.hu')
-                        ->to($email)
-                        ->subject('Reset your MineSeeker password')
-                        ->htmlTemplate('emails/reset_password.html.twig')
-                        ->context([
-                            'username'  => $user->getUsername(),
-                            'reset_url' => $resetUrl,
-                        ])
-                );
+                $this->passwordResetEmail->send($email, $user->getUsername(), $resetUrl);
             }
 
-            // Always show the same flash to prevent email enumeration
             $this->addFlash('reset_sent', $email);
 
             return $this->redirectToRoute('MineSeekerBundle_forgot_password');
@@ -195,14 +162,9 @@ class SecurityController extends AbstractController
     }
 
     #[Route('/reset-password/{token}', name: 'MineSeekerBundle_reset_password')]
-    public function resetPassword(
-        string                      $token,
-        Request                     $request,
-        UserRepository              $userRepository,
-        EntityManagerInterface      $em,
-        UserPasswordHasherInterface $hasher,
-    ): Response {
-        $user = $userRepository->findOneByResetToken($token);
+    public function resetPassword(string $token): Response
+    {
+        $user = $this->userRepository->findOneByResetToken($token);
 
         if (!$user || $user->resetTokenExpiresAt < new DateTime()) {
             $this->addFlash('error', 'This password reset link is invalid or has expired.');
@@ -210,13 +172,14 @@ class SecurityController extends AbstractController
         }
 
         $form = $this->createForm(ResetPasswordFormType::class);
-        $form->handleRequest($request);
+        $form->handleRequest($this->requestStack->getCurrentRequest());
 
         if ($form->isSubmitted() && $form->isValid()) {
-            $user->password = $hasher->hashPassword($user, $form->get('plainPassword')->getData());
+            $user->password = $this->passwordHasher->hashPassword($user, $form->get('plainPassword')->getData());
             $user->resetToken = null;
             $user->resetTokenExpiresAt = null;
-            $em->flush();
+
+            $this->em->flush();
 
             $this->addFlash('success', 'Your password has been reset. You can now sign in.');
 
@@ -227,9 +190,9 @@ class SecurityController extends AbstractController
     }
 
     #[Route('/activate/{token}', name: 'MineSeekerBundle_activate')]
-    public function activate(string $token, EntityManagerInterface $em, MailerInterface $mailer): Response
+    public function activate(string $token): Response
     {
-        $user = $em->getRepository(User::class)->findOneBy(['verificationToken' => $token]);
+        $user = $this->em->getRepository(User::class)->findOneBy(['verificationToken' => $token]);
 
         if (!$user) {
             $this->addFlash('error', 'This activation link is invalid or has already been used.');
@@ -238,20 +201,9 @@ class SecurityController extends AbstractController
 
         $user->isVerified = true;
         $user->verificationToken = null;
-        $em->flush();
+        $this->em->flush();
 
-        /** Send admin notification about account activation */
-        $mailer->send(
-            new TemplatedEmail()
-                ->from('noreply@mineseeker.hu')
-                ->to($this->appContactMailAddress)
-                ->subject('✅ User Account Activated: ' . $user->getUsername())
-                ->htmlTemplate('emails/user_activation_notification.html.twig')
-                ->context([
-                    'user'        => $user,
-                    'activatedAt' => new DateTime(),
-                ])
-        );
+        $this->activationNotificationEmail->send($user, new DateTime());
 
         $this->addFlash('success', 'Your account is now active. Welcome, ' . $user->getUsername() . '!');
 
diff --git a/src/Service/Email/SendActivationEmailService.php b/src/Service/Email/SendActivationEmailService.php
new file mode 100644
index 0000000..bb72ef3
--- /dev/null
+++ b/src/Service/Email/SendActivationEmailService.php
@@ -0,0 +1,71 @@
+<?php declare(strict_types=1);
+/**
+ * This file is part of the SplendidBear Websites' projects.
+ *
+ * Copyright (c) 2026 @ www.splendidbear.org
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/*
+ * This file is part of the SplendidBear Websites' projects.
+ *
+ * Copyright (c) 2026 @ www.splendidbear.org
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Service\Email;
+
+use App\Entity\User;
+use Exception;
+use Psr\Log\LoggerInterface;
+use RuntimeException;
+use Symfony\Bridge\Twig\Mime\TemplatedEmail;
+use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
+use Symfony\Component\Mailer\MailerInterface;
+
+/**
+ * Class SendActivationEmailService
+ *
+ * @package  App\Service\Email
+ * @author   Lang <https://www.splendidbear.org>
+ * @category Class
+ * @license  https://www.gnu.org/licenses/lgpl-3.0.en.html GNU Lesser General Public License
+ * @link     www.splendidbear.org
+ * @since    2026. 04. 20.
+ */
+readonly final class SendActivationEmailService
+{
+    public function __construct(
+        private LoggerInterface $logger,
+        private MailerInterface $mailer,
+    ) {
+    }
+
+    public function send(User $user, string $activationUrl): void
+    {
+        try {
+            $this->mailer->send(
+                new TemplatedEmail()
+                    ->from('noreply@mineseeker.hu')
+                    ->to($user->email)
+                    ->subject('Activate your MineSeeker account')
+                    ->htmlTemplate('emails/activation.html.twig')
+                    ->context([
+                        'username'       => $user->getUsername(),
+                        'activation_url' => $activationUrl,
+                    ])
+            );
+        } catch (TransportExceptionInterface|Exception $e) {
+            $this->logger->error("Failed to send activation email: {$e->getMessage()}", [
+                'exception' => $e,
+                'user'      => $user->getUsername(),
+            ]);
+            throw new RuntimeException("Failed to send activation email: {$e->getMessage()}");
+        }
+    }
+}
+
diff --git a/src/Service/Email/SendPasswordResetEmailService.php b/src/Service/Email/SendPasswordResetEmailService.php
new file mode 100644
index 0000000..a96378e
--- /dev/null
+++ b/src/Service/Email/SendPasswordResetEmailService.php
@@ -0,0 +1,70 @@
+<?php declare(strict_types=1);
+/**
+ * This file is part of the SplendidBear Websites' projects.
+ *
+ * Copyright (c) 2026 @ www.splendidbear.org
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/*
+ * This file is part of the SplendidBear Websites' projects.
+ *
+ * Copyright (c) 2026 @ www.splendidbear.org
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Service\Email;
+
+use Exception;
+use Psr\Log\LoggerInterface;
+use RuntimeException;
+use Symfony\Bridge\Twig\Mime\TemplatedEmail;
+use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
+use Symfony\Component\Mailer\MailerInterface;
+
+/**
+ * Class SendPasswordResetEmailService
+ *
+ * @package  App\Service\Email
+ * @author   Lang <https://www.splendidbear.org>
+ * @category Class
+ * @license  https://www.gnu.org/licenses/lgpl-3.0.en.html GNU Lesser General Public License
+ * @link     www.splendidbear.org
+ * @since    2026. 04. 20.
+ */
+readonly final class SendPasswordResetEmailService
+{
+    public function __construct(
+        private LoggerInterface $logger,
+        private MailerInterface $mailer,
+    ) {
+    }
+
+    public function send(string $email, string $username, string $resetUrl): void
+    {
+        try {
+            $this->mailer->send(
+                new TemplatedEmail()
+                    ->from('noreply@mineseeker.hu')
+                    ->to($email)
+                    ->subject('Reset your MineSeeker password')
+                    ->htmlTemplate('emails/reset_password.html.twig')
+                    ->context([
+                        'username'  => $username,
+                        'reset_url' => $resetUrl,
+                    ])
+            );
+        } catch (TransportExceptionInterface|Exception $e) {
+            $this->logger->error("Failed to send password reset email: {$e->getMessage()}", [
+                'exception' => $e,
+                'email'     => $email,
+            ]);
+            throw new RuntimeException("Failed to send password reset email: {$e->getMessage()}");
+        }
+    }
+}
+
diff --git a/src/Service/Email/SendUserActivationNotificationService.php b/src/Service/Email/SendUserActivationNotificationService.php
new file mode 100644
index 0000000..3fbf884
--- /dev/null
+++ b/src/Service/Email/SendUserActivationNotificationService.php
@@ -0,0 +1,75 @@
+<?php declare(strict_types=1);
+/**
+ * This file is part of the SplendidBear Websites' projects.
+ *
+ * Copyright (c) 2026 @ www.splendidbear.org
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/*
+ * This file is part of the SplendidBear Websites' projects.
+ *
+ * Copyright (c) 2026 @ www.splendidbear.org
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Service\Email;
+
+use App\Entity\User;
+use DateTime;
+use Exception;
+use Psr\Log\LoggerInterface;
+use RuntimeException;
+use Symfony\Bridge\Twig\Mime\TemplatedEmail;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
+use Symfony\Component\Mailer\MailerInterface;
+
+/**
+ * Class SendUserActivationNotificationService
+ *
+ * @package  App\Service\Email
+ * @author   Lang <https://www.splendidbear.org>
+ * @category Class
+ * @license  https://www.gnu.org/licenses/lgpl-3.0.en.html GNU Lesser General Public License
+ * @link     www.splendidbear.org
+ * @since    2026. 04. 20.
+ */
+readonly final class SendUserActivationNotificationService
+{
+    public function __construct(
+        #[Autowire(env: 'APP_CONTACT_MAIL_ADDRESS')]
+        private string          $appContactMailAddress,
+        private LoggerInterface $logger,
+        private MailerInterface $mailer,
+    ) {
+    }
+
+    public function send(User $user, DateTime $activatedAt): void
+    {
+        try {
+            $this->mailer->send(
+                new TemplatedEmail()
+                    ->from('noreply@mineseeker.hu')
+                    ->to($this->appContactMailAddress)
+                    ->subject("✅ User Account Activated: {$user->getUsername()}")
+                    ->htmlTemplate('emails/user_activation_notification.html.twig')
+                    ->context([
+                        'user'        => $user,
+                        'activatedAt' => $activatedAt,
+                    ])
+            );
+        } catch (TransportExceptionInterface|Exception $e) {
+            $this->logger->error("Failed to send user activation notification: {$e->getMessage()}", [
+                'exception' => $e,
+                'user'      => $user->getUsername(),
+            ]);
+            throw new RuntimeException("Failed to send user activation notification: {$e->getMessage()}");
+        }
+    }
+}
+
diff --git a/src/Service/Email/SendUserRegistrationNotificationService.php b/src/Service/Email/SendUserRegistrationNotificationService.php
new file mode 100644
index 0000000..8f0a4c6
--- /dev/null
+++ b/src/Service/Email/SendUserRegistrationNotificationService.php
@@ -0,0 +1,75 @@
+<?php declare(strict_types=1);
+/**
+ * This file is part of the SplendidBear Websites' projects.
+ *
+ * Copyright (c) 2026 @ www.splendidbear.org
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/*
+ * This file is part of the SplendidBear Websites' projects.
+ *
+ * Copyright (c) 2026 @ www.splendidbear.org
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Service\Email;
+
+use App\Entity\User;
+use DateTime;
+use Exception;
+use Psr\Log\LoggerInterface;
+use RuntimeException;
+use Symfony\Bridge\Twig\Mime\TemplatedEmail;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
+use Symfony\Component\Mailer\MailerInterface;
+
+/**
+ * Class SendUserRegistrationNotificationService
+ *
+ * @package  App\Service\Email
+ * @author   Lang <https://www.splendidbear.org>
+ * @category Class
+ * @license  https://www.gnu.org/licenses/lgpl-3.0.en.html GNU Lesser General Public License
+ * @link     www.splendidbear.org
+ * @since    2026. 04. 20.
+ */
+readonly final class SendUserRegistrationNotificationService
+{
+    public function __construct(
+        #[Autowire(env: 'APP_CONTACT_MAIL_ADDRESS')]
+        private string          $appContactMailAddress,
+        private LoggerInterface $logger,
+        private MailerInterface $mailer,
+    ) {
+    }
+
+    public function send(User $user, DateTime $registeredAt): void
+    {
+        try {
+            $this->mailer->send(
+                new TemplatedEmail()
+                    ->from('noreply@mineseeker.hu')
+                    ->to($this->appContactMailAddress)
+                    ->subject("🎉 New User Registration: {$user->getUsername()}")
+                    ->htmlTemplate('emails/user_registration_notification.html.twig')
+                    ->context([
+                        'user'         => $user,
+                        'registeredAt' => $registeredAt,
+                    ])
+            );
+        } catch (TransportExceptionInterface|Exception $e) {
+            $this->logger->error("Failed to send user registration notification: {$e->getMessage()}", [
+                'exception' => $e,
+                'user'      => $user->getUsername(),
+            ]);
+            throw new RuntimeException("Failed to send user registration notification: {$e->getMessage()}");
+        }
+    }
+}
+