diff --git a/core/lib/presentation/utils/app_toast.dart b/core/lib/presentation/utils/app_toast.dart
index ce6bfa798..ba800c21d 100644
--- a/core/lib/presentation/utils/app_toast.dart
+++ b/core/lib/presentation/utils/app_toast.dart
@@ -123,7 +123,7 @@ class AppToast {
     fToast.showToast(
       child: toast,
       gravity: ToastGravity.BOTTOM,
-      toastDuration: toastLength ?? Duration(seconds: 2),
+      toastDuration: toastLength ?? Duration(seconds: 3),
     );
   }
 }
diff --git a/lib/features/mailbox/data/network/mailbox_api.dart b/lib/features/mailbox/data/network/mailbox_api.dart
index 6866f4b72..dd252a900 100644
--- a/lib/features/mailbox/data/network/mailbox_api.dart
+++ b/lib/features/mailbox/data/network/mailbox_api.dart
@@ -5,6 +5,8 @@ import 'package:jmap_dart_client/http/http_client.dart';
 import 'package:jmap_dart_client/jmap/account_id.dart';
 import 'package:jmap_dart_client/jmap/core/capability/capability_identifier.dart';
 import 'package:jmap_dart_client/jmap/core/capability/core_capability.dart';
+import 'package:jmap_dart_client/jmap/core/error/method/error_method_response.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
 import 'package:jmap_dart_client/jmap/core/patch_object.dart';
 import 'package:jmap_dart_client/jmap/core/properties/properties.dart';
 import 'package:jmap_dart_client/jmap/core/request/reference_path.dart';
@@ -125,16 +127,34 @@ class MailboxAPI {
         setMailboxInvocation.methodCallId,
         SetMailboxResponse.deserialize);
 
-    return Future.sync(() async {
-      final newMailbox = setMailboxResponse?.created?[request.creationId];
-      if (newMailbox != null) {
-        return newMailbox.addMailboxName(newMailbox, request.newName, parentId: request.parentId);
+    final mapMailboxCreated = setMailboxResponse?.created;
+    if (mapMailboxCreated != null &&
+        mapMailboxCreated.containsKey(request.creationId)) {
+      final mailboxCreated = mapMailboxCreated[request.creationId]!;
+      final newMailboxCreated = mailboxCreated.toMailbox(
+          request.newName,
+          parentId: request.parentId);
+      return newMailboxCreated;
+    } else {
+      throw _parseErrorForSetMailboxResponse(setMailboxResponse, request.creationId);
+    }
+  }
+
+  _parseErrorForSetMailboxResponse(SetMailboxResponse? response, Id requestId) {
+    final mapError = response?.notCreated ?? response?.notUpdated ?? response?.notDestroyed;
+    if (mapError != null && mapError.containsKey(requestId)) {
+      final setError = mapError[requestId];
+      log('MailboxAPI::_parseErrorForSetMailboxResponse():setError: $setError');
+      if (setError?.type == ErrorMethodResponse.invalidArguments) {
+        throw InvalidArgumentsMethodResponse(description: setError?.description);
+      } else if (setError?.type == ErrorMethodResponse.invalidResultReference) {
+        throw InvalidResultReferenceMethodResponse(description: setError?.description);
       } else {
-        return null;
+        throw UnknownMethodResponse(description: setError?.description);
       }
-    }).catchError((error) {
-      throw error;
-    });
+    }  else {
+      throw UnknownMethodResponse();
+    }
   }
 
   Future<bool> deleteMultipleMailbox(Session session, AccountId accountId, List<MailboxId> mailboxIds) async {
diff --git a/lib/features/mailbox/presentation/mailbox_controller.dart b/lib/features/mailbox/presentation/mailbox_controller.dart
index e4c433121..892570d5f 100644
--- a/lib/features/mailbox/presentation/mailbox_controller.dart
+++ b/lib/features/mailbox/presentation/mailbox_controller.dart
@@ -7,6 +7,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_svg/flutter_svg.dart';
 import 'package:get/get.dart';
 import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/error/method/error_method_response.dart';
 import 'package:jmap_dart_client/jmap/core/id.dart';
 import 'package:jmap_dart_client/jmap/core/state.dart' as jmap;
 import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
@@ -411,11 +412,17 @@ class MailboxController extends BaseMailboxController {
 
   void _createNewMailboxFailure(CreateNewMailboxFailure failure) {
     if (currentOverlayContext != null && currentContext != null) {
+      final exception = failure.exception;
+      var messageError = AppLocalizations.of(currentContext!).create_new_mailbox_failure;
+      if (exception is ErrorMethodResponse) {
+        messageError = exception.description ?? AppLocalizations.of(currentContext!).create_new_mailbox_failure;
+      }
+
       _appToast.showToastWithIcon(
           currentOverlayContext!,
-          textColor: AppColor.toastErrorBackgroundColor,
-          message: AppLocalizations.of(currentContext!).create_new_mailbox_failure,
-          icon: _imagePaths.icFolderMailbox);
+          message: messageError,
+          iconColor: AppColor.toastErrorBackgroundColor,
+          icon: _imagePaths.icNotConnection);
     }
   }
 
diff --git a/model/lib/extensions/mailbox_extension.dart b/model/lib/extensions/mailbox_extension.dart
index 8b86a7078..1da03bf49 100644
--- a/model/lib/extensions/mailbox_extension.dart
+++ b/model/lib/extensions/mailbox_extension.dart
@@ -38,7 +38,7 @@ extension MailboxExtension on Mailbox {
     );
   }
 
-  Mailbox addMailboxName(Mailbox newMailbox, MailboxName mailboxName, {MailboxId? parentId}) {
+  Mailbox toMailbox(MailboxName mailboxName, {MailboxId? parentId}) {
     return Mailbox(
         id: id,
         name: mailboxName,