diff --git a/apps/settings/serializers/msg.py b/apps/settings/serializers/msg.py
index ace4ab42c..44124bfa9 100644
--- a/apps/settings/serializers/msg.py
+++ b/apps/settings/serializers/msg.py
@@ -30,7 +30,7 @@ class EmailSettingSerializer(serializers.Serializer):
     )
     EMAIL_HOST = serializers.CharField(max_length=1024, required=True, label=_("Host"))
     EMAIL_PORT = serializers.CharField(max_length=5, required=True, label=_("Port"))
-    EMAIL_HOST_USER = serializers.CharField(max_length=128, required=True, label=_("Account"))
+    EMAIL_HOST_USER = serializers.CharField(max_length=128, allow_blank=True, required=False, label=_("Account"))
     EMAIL_HOST_PASSWORD = EncryptedField(
         max_length=1024, required=False, label=_("Password"),
         help_text=_("Tips: Some provider use token except password")