diff --git a/src/main/java/com/backendsystemdesignlab/notification/notification/controller/NotificationController.java b/src/main/java/com/backendsystemdesignlab/notification/notification/controller/NotificationController.java
index 6fa4fcc..5f14af9 100644
--- a/src/main/java/com/backendsystemdesignlab/notification/notification/controller/NotificationController.java
+++ b/src/main/java/com/backendsystemdesignlab/notification/notification/controller/NotificationController.java
@@ -21,7 +21,7 @@ public class NotificationController {
     @PostMapping
     public ResponseEntity<SendNotificationResponse> send(@Valid @RequestBody SendNotificationRequest request) {
         SendNotificationResponse response = notificationService.send(request);
-        return ResponseEntity.accepted().body(response); // 아직 실제 전송이 완료된 게 아니라 요청 접수 단계 (202 Accepted)
+        return ResponseEntity.ok(response);
     }
 
 }
diff --git a/src/main/java/com/backendsystemdesignlab/notification/notification/provider/EmailProvider.java b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/EmailProvider.java
new file mode 100644
index 0000000..d57d1a7
--- /dev/null
+++ b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/EmailProvider.java
@@ -0,0 +1,5 @@
+package com.backendsystemdesignlab.notification.notification.provider;
+
+public interface EmailProvider {
+    ProviderResult send(String email);
+}
diff --git a/src/main/java/com/backendsystemdesignlab/notification/notification/provider/ProviderResult.java b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/ProviderResult.java
new file mode 100644
index 0000000..45d4544
--- /dev/null
+++ b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/ProviderResult.java
@@ -0,0 +1,6 @@
+package com.backendsystemdesignlab.notification.notification.provider;
+
+public record ProviderResult(
+        boolean success
+) {
+}
diff --git a/src/main/java/com/backendsystemdesignlab/notification/notification/provider/PushProvider.java b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/PushProvider.java
new file mode 100644
index 0000000..78c7aa3
--- /dev/null
+++ b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/PushProvider.java
@@ -0,0 +1,5 @@
+package com.backendsystemdesignlab.notification.notification.provider;
+
+public interface PushProvider {
+    ProviderResult send(String deviceToken);
+}
diff --git a/src/main/java/com/backendsystemdesignlab/notification/notification/provider/SmsProvider.java b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/SmsProvider.java
new file mode 100644
index 0000000..6aac852
--- /dev/null
+++ b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/SmsProvider.java
@@ -0,0 +1,5 @@
+package com.backendsystemdesignlab.notification.notification.provider;
+
+public interface SmsProvider {
+    ProviderResult send(String phoneNumber);
+}
diff --git a/src/main/java/com/backendsystemdesignlab/notification/notification/provider/mock/MockEmailProvider.java b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/mock/MockEmailProvider.java
new file mode 100644
index 0000000..576c3b0
--- /dev/null
+++ b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/mock/MockEmailProvider.java
@@ -0,0 +1,24 @@
+package com.backendsystemdesignlab.notification.notification.provider.mock;
+
+import com.backendsystemdesignlab.notification.notification.provider.EmailProvider;
+import com.backendsystemdesignlab.notification.notification.provider.ProviderResult;
+import org.springframework.stereotype.Component;
+
+@Component
+public class MockEmailProvider implements EmailProvider {
+
+    @Override
+    public ProviderResult send(String deviceToken) {
+        simulateDelay();
+        return new ProviderResult(true);
+    }
+
+    private void simulateDelay() {
+        try {
+            Thread.sleep(100);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new IllegalStateException(e);
+        }
+    }
+}
diff --git a/src/main/java/com/backendsystemdesignlab/notification/notification/provider/mock/MockPushProvider.java b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/mock/MockPushProvider.java
new file mode 100644
index 0000000..36bf887
--- /dev/null
+++ b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/mock/MockPushProvider.java
@@ -0,0 +1,24 @@
+package com.backendsystemdesignlab.notification.notification.provider.mock;
+
+import com.backendsystemdesignlab.notification.notification.provider.ProviderResult;
+import com.backendsystemdesignlab.notification.notification.provider.PushProvider;
+import org.springframework.stereotype.Component;
+
+@Component
+public class MockPushProvider implements PushProvider {
+
+    @Override
+    public ProviderResult send(String deviceToken) {
+        simulateDelay();
+        return new ProviderResult(true);
+    }
+
+    private void simulateDelay() {
+        try {
+            Thread.sleep(100);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new IllegalStateException(e);
+        }
+    }
+}
diff --git a/src/main/java/com/backendsystemdesignlab/notification/notification/provider/mock/MockSmsProvider.java b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/mock/MockSmsProvider.java
new file mode 100644
index 0000000..c07c252
--- /dev/null
+++ b/src/main/java/com/backendsystemdesignlab/notification/notification/provider/mock/MockSmsProvider.java
@@ -0,0 +1,24 @@
+package com.backendsystemdesignlab.notification.notification.provider.mock;
+
+import com.backendsystemdesignlab.notification.notification.provider.ProviderResult;
+import com.backendsystemdesignlab.notification.notification.provider.SmsProvider;
+import org.springframework.stereotype.Component;
+
+@Component
+public class MockSmsProvider implements SmsProvider {
+
+    @Override
+    public ProviderResult send(String deviceToken) {
+        simulateDelay();
+        return new ProviderResult(true);
+    }
+
+    private void simulateDelay() {
+        try {
+            Thread.sleep(100);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new IllegalStateException(e);
+        }
+    }
+}
diff --git a/src/main/java/com/backendsystemdesignlab/notification/notification/service/NotificationService.java b/src/main/java/com/backendsystemdesignlab/notification/notification/service/NotificationService.java
index b40d91f..e73acea 100644
--- a/src/main/java/com/backendsystemdesignlab/notification/notification/service/NotificationService.java
+++ b/src/main/java/com/backendsystemdesignlab/notification/notification/service/NotificationService.java
@@ -1,9 +1,14 @@
 package com.backendsystemdesignlab.notification.notification.service;
 
+import com.backendsystemdesignlab.notification.notification.domain.DeliveryStatus;
 import com.backendsystemdesignlab.notification.notification.domain.Notification;
 import com.backendsystemdesignlab.notification.notification.domain.NotificationDelivery;
 import com.backendsystemdesignlab.notification.notification.dto.SendNotificationRequest;
 import com.backendsystemdesignlab.notification.notification.dto.SendNotificationResponse;
+import com.backendsystemdesignlab.notification.notification.provider.EmailProvider;
+import com.backendsystemdesignlab.notification.notification.provider.ProviderResult;
+import com.backendsystemdesignlab.notification.notification.provider.PushProvider;
+import com.backendsystemdesignlab.notification.notification.provider.SmsProvider;
 import com.backendsystemdesignlab.notification.notification.repository.NotificationDeliveryRepository;
 import com.backendsystemdesignlab.notification.notification.repository.NotificationRepository;
 import com.backendsystemdesignlab.notification.user.domain.NotificationChannel;
@@ -31,6 +36,10 @@ public class NotificationService {
     private final NotificationPreferenceRepository preferenceRepository;
     private final NotificationRepository notificationRepository;
     private final NotificationDeliveryRepository deliveryRepository;
+    private final PushProvider pushProvider;
+    private final SmsProvider smsProvider;
+    private final EmailProvider emailProvider;
+
 
     @Transactional
     public SendNotificationResponse send(SendNotificationRequest request) {
@@ -89,6 +98,19 @@ public SendNotificationResponse send(SendNotificationRequest request) {
 
         deliveryRepository.saveAll(deliveries);
 
+        notification.startProcessing();
+
+        sendDeliveries(deliveries);
+
+        boolean allSucceeded = deliveries.stream()
+                .allMatch(delivery -> delivery.getStatus() == DeliveryStatus.SENT);
+
+        if (allSucceeded) {
+            notification.complete();
+        } else {
+            notification.fail();
+        }
+
         return new SendNotificationResponse(
                 notification.getId(),
                 notification.getStatus(),
@@ -96,6 +118,25 @@ public SendNotificationResponse send(SendNotificationRequest request) {
         );
     }
 
+    private void sendDeliveries(List<NotificationDelivery> deliveries) {
+
+        for (NotificationDelivery delivery : deliveries) {
+            delivery.recordAttempt();
+
+            ProviderResult result = switch (delivery.getChannel()) {
+                case PUSH -> pushProvider.send(delivery.getDestination());
+                case SMS -> smsProvider.send(delivery.getDestination());
+                case EMAIL -> emailProvider.send(delivery.getDestination());
+            };
+
+            if (result.success()) {
+                delivery.markSent();
+            } else {
+                delivery.markFailed();
+            }
+        }
+    }
+
     private void createPushDeliveries(User user, Notification notification, List<NotificationDelivery> deliveries) {
         List<UserDevice> devices = userDeviceRepository.findAllByUserIdAndActiveTrue(user.getId());