修复test_smtp_fix.py中检查邮箱存在逻辑：接受HTTP 201状态码为成功

test_smtp_fix.py

@@ -133,9 +133,9 @@ def check_mailbox_exists(api_base_url, email_address):
         logger.info(f"检查/创建邮箱: {create_url}")
         
         response = requests.get(create_url)
-        if response.status_code == 200:
-            result = response.json()
-            if result.get('success'):
+        if response.status_code in [200, 201]:  # 同时接受200和201状态码
+            result = response.json() if response.content else {'success': True}
+            if result.get('success', True):  # 默认为True，因为201状态可能没有返回JSON
                 logger.info(f"邮箱检查/创建成功: {email_address}")
                 return True, None
             else: