diff --git a/lib/features/manage_account/domain/state/edit_default_identity_state.dart b/lib/features/manage_account/domain/state/edit_default_identity_state.dart
new file mode 100644
index 000000000..53537d6e3
--- /dev/null
+++ b/lib/features/manage_account/domain/state/edit_default_identity_state.dart
@@ -0,0 +1,21 @@
+import 'package:core/core.dart';
+import 'package:tmail_ui_user/features/manage_account/domain/state/edit_identity_state.dart';
+
+class EditDefaultIdentityLoading extends UIState {}
+
+class EditDefaultIdentitySuccess extends EditIdentitySuccess {
+
+  EditDefaultIdentitySuccess();
+
+  @override
+  List<Object?> get props => [];
+}
+
+class EditDefaultIdentityFailure extends FeatureFailure {
+  final dynamic exception;
+
+  EditDefaultIdentityFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}
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diff --git a/lib/features/manage_account/domain/usecases/edit_default_identity_interactor.dart b/lib/features/manage_account/domain/usecases/edit_default_identity_interactor.dart
new file mode 100644
index 000000000..aea9fe7d7
--- /dev/null
+++ b/lib/features/manage_account/domain/usecases/edit_default_identity_interactor.dart
@@ -0,0 +1,65 @@
+import 'dart:core';
+
+import 'package:core/core.dart';
+import 'package:dartz/dartz.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/properties/properties.dart';
+import 'package:jmap_dart_client/jmap/identities/identity.dart';
+import 'package:tmail_ui_user/features/manage_account/domain/model/edit_default_identity_request.dart';
+import 'package:tmail_ui_user/features/manage_account/domain/model/edit_identity_request.dart';
+import 'package:tmail_ui_user/features/manage_account/domain/repository/identity_repository.dart';
+import 'package:tmail_ui_user/features/manage_account/domain/state/edit_default_identity_state.dart';
+import 'package:tmail_ui_user/features/manage_account/presentation/profiles/identities/utils/identity_utils.dart';
+
+class EditDefaultIdentityInteractor {
+  final IdentityRepository _identityRepository;
+  final IdentityUtils _identityUtils;
+
+  EditDefaultIdentityInteractor(
+    this._identityRepository,
+    this._identityUtils
+  );
+
+  Stream<Either<Failure, Success>> execute(
+      AccountId accountId,
+      EditIdentityRequest editIdentityRequest
+  ) async* {
+    try {
+      yield Right(EditDefaultIdentityLoading());
+
+      final defaultIdentities = await _getDefaultIdentities(accountId);
+      _removeEditIdentityFromDefaultIdentities(defaultIdentities, editIdentityRequest.identityId);
+
+      final editDefaultRequest = EditDefaultIdentityRequest(
+        identityId: editIdentityRequest.identityId, 
+        identityRequest: editIdentityRequest.identityRequest,
+        isDefaultIdentity: editIdentityRequest.isDefaultIdentity,
+        oldDefaultIdentityIds: defaultIdentities
+            ?.map((identity) => identity.id!)
+            .toList());
+
+      final result = await _identityRepository.editIdentity(accountId, editDefaultRequest);
+      yield result ? Right(EditDefaultIdentitySuccess()) : Left(EditDefaultIdentityFailure(null));
+    } catch (exception) {
+      yield Left(EditDefaultIdentityFailure(exception));
+    }
+  }
+
+  Future<List<Identity>?> _getDefaultIdentities(AccountId accountId) async {
+    final listIdentities = await _identityRepository
+        .getAllIdentities(
+            accountId, 
+            properties: Properties({'sortOrder'})
+        );
+    return _identityUtils
+        .getSmallestOrderedIdentity(listIdentities.identities)
+        ?.toList();
+  }
+
+  void _removeEditIdentityFromDefaultIdentities(
+    List<Identity>? defaultIdentities, 
+    IdentityId editIdentityId
+  ) {
+    defaultIdentities?.removeWhere((identity) => identity.id == editIdentityId);
+  }
+}
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