diff --git a/backend/utils/validation/notification.go b/backend/utils/validation/notification.go
index 6eb77e20..6fd9f752 100644
--- a/backend/utils/validation/notification.go
+++ b/backend/utils/validation/notification.go
@@ -7,11 +7,9 @@ import (
 
 var ErrNotificationRecipient = errors.New("notification address does not accept mail")
 
-// notification 为主发信账号；notification+system 为历史保留兼容账号。
-// 两者均为系统保留地址，禁止普通用户占用，且拒收任何外部来信。
+// notification 为系统专属发信账号，禁止普通用户占用，且拒收任何外部来信。
 const (
-	NotificationLocalPart       = "notification"
-	LegacyNotificationLocalPart = "notification+system"
+	NotificationLocalPart = "notification"
 )
 
 func NotificationAddress(domain string) string {
@@ -21,19 +19,12 @@ func NotificationAddress(domain string) string {
 	return NotificationLocalPart + "@" + domain
 }
 
-func LegacyNotificationAddress(domain string) string {
-	if domain == "" {
-		return ""
-	}
-	return LegacyNotificationLocalPart + "@" + domain
-}
-
 func IsNotificationAddress(address string, domains []string) bool {
 	parts := strings.Split(strings.ToLower(strings.TrimSpace(address)), "@")
 	if len(parts) != 2 {
 		return false
 	}
-	if parts[0] != NotificationLocalPart && parts[0] != LegacyNotificationLocalPart {
+	if parts[0] != NotificationLocalPart {
 		return false
 	}
 	for _, domain := range domains {
@@ -52,5 +43,5 @@ func IsAuthorizedNotificationSender(address, domain string) bool {
 	if len(parts) != 2 || !strings.EqualFold(parts[1], domain) {
 		return false
 	}
-	return parts[0] == NotificationLocalPart || parts[0] == LegacyNotificationLocalPart
+	return parts[0] == NotificationLocalPart
 }
diff --git a/backend/utils/validation/notification_test.go b/backend/utils/validation/notification_test.go
index 253a088f..884d38e6 100644
--- a/backend/utils/validation/notification_test.go
+++ b/backend/utils/validation/notification_test.go
@@ -1,4 +1,4 @@
-package validation
+package validation
 
 import "testing"
 
@@ -9,19 +9,13 @@ func TestNotificationAddressAndSenderValidation(t *testing.T) {
 		t.Fatalf("NotificationAddress want notification@example.com, got %s", primarySender)
 	}
 
-	legacySender := LegacyNotificationAddress(domain)
-	if legacySender != "notification+system@example.com" {
-		t.Fatalf("LegacyNotificationAddress want notification+system@example.com, got %s", legacySender)
-	}
-
 	domains := []string{"example.com", "other.com"}
 
-	// 验证 IsNotificationAddress：主地址和历史地址均应被识别为通知地址
 	if !IsNotificationAddress("notification@example.com", domains) {
 		t.Fatalf("notification@example.com should be recognized as notification address")
 	}
-	if !IsNotificationAddress("notification+system@example.com", domains) {
-		t.Fatalf("notification+system@example.com should be recognized as notification address")
+	if IsNotificationAddress("notification+system@example.com", domains) {
+		t.Fatalf("notification+system@example.com should NOT be notification address")
 	}
 	if !IsNotificationAddress("NOTIFICATION@OTHER.COM", domains) {
 		t.Fatalf("case insensitive notification address check failed")
@@ -30,12 +24,11 @@ func TestNotificationAddressAndSenderValidation(t *testing.T) {
 		t.Fatalf("user@example.com should NOT be notification address")
 	}
 
-	// 验证 IsAuthorizedNotificationSender
 	if !IsAuthorizedNotificationSender("notification@example.com", domain) {
 		t.Fatalf("notification@example.com should be authorized sender")
 	}
-	if !IsAuthorizedNotificationSender("notification+system@example.com", domain) {
-		t.Fatalf("notification+system@example.com should be authorized sender")
+	if IsAuthorizedNotificationSender("notification+system@example.com", domain) {
+		t.Fatalf("notification+system@example.com should NOT be authorized notification sender")
 	}
 	if IsAuthorizedNotificationSender("attacker@example.com", domain) {
 		t.Fatalf("attacker@example.com should NOT be authorized notification sender")
diff --git a/frontend/src/views/components/HomeAside/HomeAside.vue b/frontend/src/views/components/HomeAside/HomeAside.vue
index a352cea0..e1451e3d 100644
--- a/frontend/src/views/components/HomeAside/HomeAside.vue
+++ b/frontend/src/views/components/HomeAside/HomeAside.vue
@@ -57,7 +57,7 @@
           <el-icon><Setting /></el-icon>
           <span class="settings-label">{{ lang.settings }}</span>
         </div>
-        <span class="app-version-badge">V2.13.0</span>
+        <span class="app-version-badge">V2.13.1</span>
       </button>
     </div>
   </div>