diff --git a/app.py b/app.py
index 826722b..075eea9 100644
--- a/app.py
+++ b/app.py
@@ -8,6 +8,7 @@ import smtplib
 from datetime import datetime, timedelta
 from email.mime.text import MIMEText
 from email.mime.multipart import MIMEMultipart
+from email.utils import formatdate
 from functools import wraps
 
 from flask import (
@@ -155,15 +156,73 @@ def send_email(to_email, subject, html_content):
     smtp_user = os.getenv('SMTP_USER', '')
     smtp_pass = os.getenv('SMTP_PASS', '')
 
+    print(f'[邮件发送] 准备发送邮件到: {to_email}')
+    print(f'[邮件发送] SMTP服务器: {smtp_host}:{smtp_port}')
+    print(f'[邮件发送] 发件人: {smtp_user}')
+
+    if not smtp_user or not smtp_pass:
+        raise ValueError('SMTP_USER 或 SMTP_PASS 未配置')
+
     msg = MIMEMultipart('alternative')
-    msg['From'] = f'"验证码" <{smtp_user}>'
+    msg['From'] = smtp_user
     msg['To'] = to_email
     msg['Subject'] = subject
+    msg['Date'] = formatdate(localtime=True)
     msg.attach(MIMEText(html_content, 'html', 'utf-8'))
 
-    with smtplib.SMTP_SSL(smtp_host, smtp_port) as server:
+    # 尝试SSL连接（端口465）
+    try:
+        print(f'[邮件发送] 尝试SSL连接 (端口{smtp_port})...')
+        server = smtplib.SMTP_SSL(smtp_host, smtp_port, timeout=30)
+        server.set_debuglevel(0)
+        server.ehlo()
+        print(f'[邮件发送] SSL连接成功，正在登录...')
         server.login(smtp_user, smtp_pass)
-        server.sendmail(smtp_user, to_email, msg.as_string())
+        print(f'[邮件发送] 登录成功，正在发送邮件...')
+        server.sendmail(smtp_user, [to_email], msg.as_string())
+        server.quit()
+        print(f'[邮件发送] 邮件发送成功到 {to_email}')
+        return
+    except Exception as e:
+        print(f'[邮件发送] SSL方式失败: {e}')
+
+    # 尝试STARTTLS连接（端口587）
+    try:
+        print(f'[邮件发送] 尝试STARTTLS连接 (端口587)...')
+        server = smtplib.SMTP(smtp_host, 587, timeout=30)
+        server.set_debuglevel(0)
+        server.ehlo()
+        server.starttls()
+        server.ehlo()
+        print(f'[邮件发送] STARTTLS连接成功，正在登录...')
+        server.login(smtp_user, smtp_pass)
+        print(f'[邮件发送] 登录成功，正在发送邮件...')
+        server.sendmail(smtp_user, [to_email], msg.as_string())
+        server.quit()
+        print(f'[邮件发送] 邮件发送成功到 {to_email}')
+        return
+    except Exception as e:
+        print(f'[邮件发送] STARTTLS(587)方式失败: {e}')
+
+    # 尝试STARTTLS连接（端口25）
+    try:
+        print(f'[邮件发送] 尝试STARTTLS连接 (端口25)...')
+        server = smtplib.SMTP(smtp_host, 25, timeout=30)
+        server.set_debuglevel(0)
+        server.ehlo()
+        server.starttls()
+        server.ehlo()
+        print(f'[邮件发送] STARTTLS连接成功，正在登录...')
+        server.login(smtp_user, smtp_pass)
+        print(f'[邮件发送] 登录成功，正在发送邮件...')
+        server.sendmail(smtp_user, [to_email], msg.as_string())
+        server.quit()
+        print(f'[邮件发送] 邮件发送成功到 {to_email}')
+        return
+    except Exception as e:
+        print(f'[邮件发送] STARTTLS(25)方式失败: {e}')
+
+    raise Exception(f'所有邮件发送方式均失败，请检查SMTP配置和网络连接')
 
 def get_current_user():
     return session.get('user')