diff --git a/lib/features/email/presentation/bindings/calendar_event_interactor_bindings.dart b/lib/features/email/presentation/bindings/calendar_event_interactor_bindings.dart
index be1e270481..90271d7712 100644
--- a/lib/features/email/presentation/bindings/calendar_event_interactor_bindings.dart
+++ b/lib/features/email/presentation/bindings/calendar_event_interactor_bindings.dart
@@ -11,6 +11,7 @@ import 'package:tmail_ui_user/features/email/data/repository/calendar_event_repo
 import 'package:tmail_ui_user/features/email/domain/repository/calendar_event_repository.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/calendar_event_accept_interactor.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/maybe_calendar_event_interactor.dart';
+import 'package:tmail_ui_user/features/email/domain/usecases/calendar_event_reject_interactor.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/parse_calendar_event_interactor.dart';
 import 'package:tmail_ui_user/main/exceptions/cache_exception_thrower.dart';
 import 'package:tmail_ui_user/main/exceptions/remote_exception_thrower.dart';
@@ -38,6 +39,7 @@ class CalendarEventInteractorBindings extends InteractorsBindings {
     Get.lazyPut(() => ParseCalendarEventInteractor(Get.find<CalendarEventRepository>()));
     Get.lazyPut(() => AcceptCalendarEventInteractor(Get.find<CalendarEventRepository>()));
     Get.lazyPut(() => MaybeCalendarEventInteractor(Get.find<CalendarEventRepository>()));
+    Get.lazyPut(() => RejectCalendarEventInteractor(Get.find<CalendarEventRepository>()));
   }
 
   @override
diff --git a/lib/features/email/presentation/controller/single_email_controller.dart b/lib/features/email/presentation/controller/single_email_controller.dart
index 4586c8178d..2d4ab4f4fd 100644
--- a/lib/features/email/presentation/controller/single_email_controller.dart
+++ b/lib/features/email/presentation/controller/single_email_controller.dart
@@ -38,6 +38,7 @@ import 'package:tmail_ui_user/features/email/domain/model/move_to_mailbox_reques
 import 'package:tmail_ui_user/features/email/domain/model/send_receipt_to_sender_request.dart';
 import 'package:tmail_ui_user/features/email/domain/state/calendar_event_accept_state.dart';
 import 'package:tmail_ui_user/features/email/domain/state/calendar_event_maybe_state.dart';
+import 'package:tmail_ui_user/features/email/domain/state/calendar_event_reject_state.dart';
 import 'package:tmail_ui_user/features/email/domain/state/calendar_event_reply_state.dart';
 import 'package:tmail_ui_user/features/email/domain/state/download_attachment_for_web_state.dart';
 import 'package:tmail_ui_user/features/email/domain/state/download_attachments_state.dart';
@@ -53,6 +54,7 @@ import 'package:tmail_ui_user/features/email/domain/state/unsubscribe_email_stat
 import 'package:tmail_ui_user/features/email/domain/state/view_attachment_for_web_state.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/calendar_event_accept_interactor.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/maybe_calendar_event_interactor.dart';
+import 'package:tmail_ui_user/features/email/domain/usecases/calendar_event_reject_interactor.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/download_attachment_for_web_interactor.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/download_attachments_interactor.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/export_attachment_interactor.dart';
@@ -127,6 +129,7 @@ class SingleEmailController extends BaseController with AppLoaderMixin {
   ParseCalendarEventInteractor? _parseCalendarEventInteractor;
   AcceptCalendarEventInteractor? _acceptCalendarEventInteractor;
   MaybeCalendarEventInteractor? _maybeCalendarEventInteractor;
+  RejectCalendarEventInteractor? _rejectCalendarEventInteractor;
 
   final emailContents = RxnString();
   final attachments = <Attachment>[].obs;
@@ -393,6 +396,7 @@ class SingleEmailController extends BaseController with AppLoaderMixin {
     _parseCalendarEventInteractor = getBinding<ParseCalendarEventInteractor>();
     _acceptCalendarEventInteractor = getBinding<AcceptCalendarEventInteractor>();
     _maybeCalendarEventInteractor = getBinding<MaybeCalendarEventInteractor>();
+    _rejectCalendarEventInteractor = getBinding<RejectCalendarEventInteractor>();
   }
 
   void _injectCalendarEventBindings(Session? session, AccountId? accountId) {
@@ -1698,6 +1702,9 @@ class SingleEmailController extends BaseController with AppLoaderMixin {
       case EventActionType.maybe:
         _maybeCalendarEventAction();
         break;
+      case EventActionType.no:
+        _rejectCalendarEventAction();
+        break;
       default:
         break;
     }
@@ -1715,6 +1722,18 @@ class SingleEmailController extends BaseController with AppLoaderMixin {
     }
   }
 
+  void _rejectCalendarEventAction() {
+    if (_rejectCalendarEventInteractor == null
+    || _displayingEventBlobId == null
+    || mailboxDashBoardController.accountId.value == null) {
+      consumeState(Stream.value(Left(CalendarEventRejectFailure())));
+    } else {
+      consumeState(_rejectCalendarEventInteractor!.execute(
+        mailboxDashBoardController.accountId.value!,
+        {_displayingEventBlobId!}));
+    }
+  }
+
   void _maybeCalendarEventAction() {
     if (_maybeCalendarEventInteractor == null
     || _displayingEventBlobId == null
diff --git a/test/features/email/presentation/controller/single_email_controller_test.dart b/test/features/email/presentation/controller/single_email_controller_test.dart
index 57791021cb..9b0bfc9808 100644
--- a/test/features/email/presentation/controller/single_email_controller_test.dart
+++ b/test/features/email/presentation/controller/single_email_controller_test.dart
@@ -19,6 +19,7 @@ import 'package:tmail_ui_user/features/email/domain/state/parse_calendar_event_s
 import 'package:tmail_ui_user/features/email/domain/state/view_attachment_for_web_state.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/calendar_event_accept_interactor.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/maybe_calendar_event_interactor.dart';
+import 'package:tmail_ui_user/features/email/domain/usecases/calendar_event_reject_interactor.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/download_attachment_for_web_interactor.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/download_attachments_interactor.dart';
 import 'package:tmail_ui_user/features/email/domain/usecases/export_attachment_interactor.dart';
@@ -79,6 +80,7 @@ const fallbackGenerators = {
   MockSpec<PrintEmailInteractor>(),
   MockSpec<AcceptCalendarEventInteractor>(),
   MockSpec<MaybeCalendarEventInteractor>(),
+  MockSpec<RejectCalendarEventInteractor>(),
 ])
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
@@ -322,5 +324,32 @@ void main() {
         verify(maybeCalendarEventInteractor.execute(testAccountId, {blobId})).called(1);
       });
     });
+
+    group('reject test:', () {
+      final rejectCalendarEventInteractor = MockRejectCalendarEventInteractor();
+
+      test('should call execute on RejectCalendarEventInteractor '
+      'when onCalendarEventReplyAction is called on EventActionType.yes', () async {
+        // arrange
+        when(mailboxDashboardController.selectedEmail).thenReturn(Rxn(null));
+        when(mailboxDashboardController.emailUIAction).thenReturn(Rxn(null));
+        when(mailboxDashboardController.viewState).thenReturn(Rx(Right(UIState.idle)));
+        singleEmailController.onInit();
+        Get.put<RejectCalendarEventInteractor>(rejectCalendarEventInteractor);
+        mailboxDashboardController.accountId.refresh();
+        singleEmailController.handleSuccessViewState(
+          ParseCalendarEventSuccess([
+            BlobCalendarEvent(
+              blobId: blobId,
+              calendarEventList: [calendarEvent])]));
+        
+        // act
+        singleEmailController.onCalendarEventReplyAction(EventActionType.no);
+        await untilCalled(rejectCalendarEventInteractor.execute(any, any));
+
+        // assert
+        verify(rejectCalendarEventInteractor.execute(testAccountId, {blobId})).called(1);
+      });
+    });
   });
 }