diff --git a/domain_admin/service/cache_domain_info_service.py b/domain_admin/service/cache_domain_info_service.py
index 2396ee592d..13a53ec658 100644
--- a/domain_admin/service/cache_domain_info_service.py
+++ b/domain_admin/service/cache_domain_info_service.py
@@ -7,7 +7,6 @@
 
 from domain_admin.model.cache_domain_info_model import CacheDomainInfoModel
 from domain_admin.utils import domain_util
-from domain_admin.utils import domain_util
 from domain_admin.utils.whois_util import whois_util
 
 
@@ -34,7 +33,7 @@ def get_domain_info(domain: str) -> CacheDomainInfoModel:
             domain=root_domain,
             domain_start_time=domain_whois['start_time'],
             domain_expire_time=domain_whois['expire_time'],
-            expire_time=datetime.now() + timedelta(hours=1)
+            expire_time=domain_whois['expire_time'] - timedelta(minutes=3)
         )
 
     return row
diff --git a/domain_admin/service/domain_service.py b/domain_admin/service/domain_service.py
index 67afcb2042..aae0f7718d 100644
--- a/domain_admin/service/domain_service.py
+++ b/domain_admin/service/domain_service.py
@@ -1,15 +1,13 @@
 # -*- coding: utf-8 -*-
-import json
-import os
 import time
 import traceback
 import warnings
 from datetime import datetime
 
-from playhouse.shortcuts import model_to_dict
 from peewee import chunked
+from playhouse.shortcuts import model_to_dict
+
 from domain_admin.log import logger
-from domain_admin.model.base_model import db
 from domain_admin.model.domain_model import DomainModel
 from domain_admin.model.group_model import GroupModel
 from domain_admin.model.log_scheduler_model import LogSchedulerModel
@@ -22,7 +20,6 @@
 from domain_admin.utils import domain_util
 from domain_admin.utils.cert_util import cert_common
 from domain_admin.utils.flask_ext.app_exception import AppException, ForbiddenAppException
-from concurrent.futures import ThreadPoolExecutor
 
 
 def add_domain(data):
diff --git a/domain_admin/service/email_service.py b/domain_admin/service/email_service.py
index 0715cb1307..5fe1e31b0b 100644
--- a/domain_admin/service/email_service.py
+++ b/domain_admin/service/email_service.py
@@ -1,13 +1,13 @@
 # -*- coding: utf-8 -*-
-from domain_admin.log import logger
 from domain_admin.service import system_service
 from domain_admin.utils.email_util import EmailServer
-from domain_admin.utils.flask_ext.app_exception import AppException
 
 
-def send_email(content: str,
-               to_addresses: list,
-               content_type: str = 'plain'):
+def send_email(
+        content: str,
+        to_addresses: list,
+        content_type: str = 'plain'
+):
     """
     发送邮件
     :param content:
diff --git a/domain_admin/utils/email_util.py b/domain_admin/utils/email_util.py
index 0b8219c867..cbec564059 100644
--- a/domain_admin/utils/email_util.py
+++ b/domain_admin/utils/email_util.py
@@ -6,7 +6,16 @@
 
 
 class EmailServer(object):
-    def __init__(self, mail_host, mail_port,mail_alias, mail_username, mail_password):
+    """
+    邮件发送
+    """
+
+    def __init__(self,
+                 mail_host,
+                 mail_port,
+                 mail_alias,
+                 mail_username,
+                 mail_password):
         self.mail_host = mail_host
         self.mail_port = mail_port
         self.mail_alias = mail_alias
@@ -24,6 +33,11 @@ def server(self):
 
         return self._server
 
+    def quit(self):
+        if self.server:
+            self.server.quit()
+            self._server = None
+
     def get_server(self):
         """
         获取邮件服务器
@@ -47,15 +61,11 @@ def get_server(self):
 
         return server
 
-    def quit(self):
-        if self.server:
-            self.server.quit()
-
     def get_email_content(self, subject, content, content_type='plain'):
         # 构造邮件
         msg = MIMEText(content, content_type, 'utf-8')
         # 邮箱昵称、发件人邮箱账号
-        msg['From'] = formataddr([self.mail_alias, self.mail_username])
+        msg['From'] = formataddr((self.mail_alias, self.mail_username))
         # msg['To'] = to_addresses.join(',')
         msg['Subject'] = subject
         return msg