diff --git a/requirements.txt b/requirements.txt
index 93b8ba34..3e8d1d9c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,3 +14,4 @@ aiosqlite>=0.19.0
 psycopg[binary]>=3.1.18
 # 自动绑卡（local_auto）依赖
 playwright>=1.40.0
+requests>=2.33.1
diff --git a/src/web/routes/email.py b/src/web/routes/email.py
index 8dfb1b45..a303d080 100644
--- a/src/web/routes/email.py
+++ b/src/web/routes/email.py
@@ -452,6 +452,9 @@ async def update_email_service(service_id: int, request: EmailServiceUpdate):
             # 合并配置而不是替换
             current_config = normalize_email_service_config(service.service_type, service.config)
             merged_config = {**current_config, **request.config}
+            # 显式清空 CloudMail 子域名
+            if "subdomain" in request.config and not str(request.config.get("subdomain") or "").strip():
+                merged_config.pop("subdomain", None)
             # 移除空值
             merged_config = {k: v for k, v in merged_config.items() if v}
             update_data["config"] = normalize_email_service_config(service.service_type, merged_config)
diff --git a/static/js/email_services.js b/static/js/email_services.js
index 0cd23ceb..7d464afe 100644
--- a/static/js/email_services.js
+++ b/static/js/email_services.js
@@ -585,7 +585,7 @@ async function handleAddCustom(e) {
             domain: formData.get('fm_domain')
         };
     } else if (subType === 'cloudmail') {
-        serviceType = 'cloud_mail';
+        serviceType = 'cloudmail';
         const domainInput = formData.get('cm_domain');
         let domain = domainInput;
         if (domainInput && domainInput.includes(',')) {
@@ -940,11 +940,9 @@ async function handleEditCustom(e) {
             admin_email: formData.get('cm_admin_email'),
             domain: domain
         };
-        // 添加子域配置（如果有）
+        // 始终带上 subdomain，便于后端识别清空操作
         const subdomain = formData.get('cm_subdomain');
-        if (subdomain && subdomain.trim()) {
-            config.subdomain = subdomain.trim();
-        }
+        config.subdomain = (subdomain || '').trim();
         const pwd = formData.get('cm_admin_password');
         if (pwd && pwd.trim()) config.admin_password = pwd.trim();
     } else {