diff --git a/app/__init__.py b/app/__init__.py
index 6193d0f..9cf92c0 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -2,7 +2,10 @@ from flask import Flask, request, jsonify, render_template
 from .config import Config
 from .utils import get_latest_emails, get_latest_email_with_code, add_allowed_domain, remove_allowed_domain, get_allowed_domains, get_allowed_domains_with_time
 import redis
-import smtp_server
+import sys
+import os
+sys.path.append(os.path.dirname(os.path.dirname(__file__)))
+from smtp_server import start_smtp_server
 import threading
 
 def create_app():
@@ -66,7 +69,7 @@ def create_app():
             return render_template('email_detail.html', email=email)
         return "邮件不存在", 404
 
-    smtp_thread = threading.Thread(target=smtp_server.start_smtp_server, args=(app,))
+    smtp_thread = threading.Thread(target=start_smtp_server, args=(app,))
     smtp_thread.daemon = True
     smtp_thread.start()