diff --git a/lib/features/composer/presentation/extensions/handle_recipients_collapsed_extensions.dart b/lib/features/composer/presentation/extensions/handle_recipients_collapsed_extensions.dart
index dc5800c3e..45f5aed6b 100644
--- a/lib/features/composer/presentation/extensions/handle_recipients_collapsed_extensions.dart
+++ b/lib/features/composer/presentation/extensions/handle_recipients_collapsed_extensions.dart
@@ -19,7 +19,7 @@ extension HandleRecipientsCollapsedExtensions on ComposerController {
 
   bool get existEmailAddressInvalid => allListEmailAddress
       .any(
-        (emailAddress) => !EmailUtils.isEmailAddressValid(
+        (emailAddress) => !EmailUtils.isValidEmail(
           emailAddress.emailAddress,
         ),
       );
diff --git a/lib/features/composer/presentation/widgets/recipient_collapsed_item_widget.dart b/lib/features/composer/presentation/widgets/recipient_collapsed_item_widget.dart
index f10cdccc5..d38df59f7 100644
--- a/lib/features/composer/presentation/widgets/recipient_collapsed_item_widget.dart
+++ b/lib/features/composer/presentation/widgets/recipient_collapsed_item_widget.dart
@@ -51,7 +51,7 @@ class RecipientCollapsedItemWidget extends StatelessWidget {
   }
 
   Color _getTagBackgroundColor() {
-    if (EmailUtils.isEmailAddressValid(emailAddress.emailAddress)) {
+    if (EmailUtils.isValidEmail(emailAddress.emailAddress)) {
       return AppColor.grayBackgroundColor;
     } else {
       return Colors.white;
@@ -59,7 +59,7 @@ class RecipientCollapsedItemWidget extends StatelessWidget {
   }
 
   Border _getTagBorder() {
-    if (EmailUtils.isEmailAddressValid(emailAddress.emailAddress)) {
+    if (EmailUtils.isValidEmail(emailAddress.emailAddress)) {
       return Border.all(
         width: 1,
         color: AppColor.grayBackgroundColor,
diff --git a/lib/features/composer/presentation/widgets/recipient_tag_item_widget.dart b/lib/features/composer/presentation/widgets/recipient_tag_item_widget.dart
index 5163a37c3..1ddcb9e2d 100644
--- a/lib/features/composer/presentation/widgets/recipient_tag_item_widget.dart
+++ b/lib/features/composer/presentation/widgets/recipient_tag_item_widget.dart
@@ -170,7 +170,7 @@ class RecipientTagItemWidget extends StatelessWidget {
   Color _getTagBackgroundColor() {
     if (isTagFocused) {
       return AppColor.colorItemRecipientSelected;
-    } else if (EmailUtils.isEmailAddressValid(currentEmailAddress.emailAddress)) {
+    } else if (EmailUtils.isValidEmail(currentEmailAddress.emailAddress)) {
       return AppColor.grayBackgroundColor;
     } else {
       return Colors.white;
@@ -183,7 +183,7 @@ class RecipientTagItemWidget extends StatelessWidget {
         width: 1,
         color: AppColor.primaryColor,
       );
-    } else if (EmailUtils.isEmailAddressValid(currentEmailAddress.emailAddress)) {
+    } else if (EmailUtils.isValidEmail(currentEmailAddress.emailAddress)) {
       return Border.all(
         width: 1,
         color: AppColor.grayBackgroundColor,
diff --git a/lib/features/email/presentation/utils/email_utils.dart b/lib/features/email/presentation/utils/email_utils.dart
index 82ab96c61..428a2c46d 100644
--- a/lib/features/email/presentation/utils/email_utils.dart
+++ b/lib/features/email/presentation/utils/email_utils.dart
@@ -20,6 +20,7 @@ import 'package:tmail_ui_user/features/email/presentation/model/email_unsubscrib
 import 'package:tmail_ui_user/features/thread/domain/constants/thread_constants.dart';
 import 'package:tmail_ui_user/main/error/capability_validator.dart';
 import 'package:tmail_ui_user/main/routes/route_utils.dart';
+import 'package:tmail_ui_user/main/utils/app_utils.dart';
 
 class EmailUtils {
   static const double desktopItemMaxWidth = 260;
@@ -110,6 +111,15 @@ class EmailUtils {
     }
   }
 
+  static bool isValidEmail(String address) {
+    try {
+      return isEmailAddressValid(address) ||
+          AppUtils.isEmailLocalhost(address);
+    } catch (_) {
+      return false;
+    }
+  }
+
   static List<String> extractMailtoLinksFromListPost(String listPost) {
     try {
       if (listPost.trim().isEmpty) return [];