python 版本： 3.8.10

用于外网查询SMB服务器ipv6 地址。服务器定时查询本机ipv6地址，如地址变动则用电邮发送新地址。

import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
import ssl
import socket
import sys 

hostname = socket.gethostname()
ipv6_list = [info[4][0] for info in socket.getaddrinfo(hostname, None, socket.AF_INET6)]
ipv6=ipv6_list[2]
print(ipv6)

with open("ipv6.txt", "r", encoding="utf-8") as file:
    ip=file.read()
    

if ip.strip()==ipv6.strip():
     print(ip)
     sys.exit()     #退出程序

with open("ipv6.txt", "w", encoding="utf-8") as file1:
     file1.write(ipv6) 

# 邮件配置信息
smtp_server = "smtp.189.cn"  # 139 邮箱的 SMTP 服务器地址
port = 465  # SSL 加密端口
sender_email = "133078654XX@189.cn"  # 发件人邮箱
password = "iM!8mA(2R%0jGXXX"  # 邮箱授权码（不是普通登录密码）
receiver_email = "133078654XX@189.cn"  # 收件人邮箱

# 邮件内容
subject = "ipv6地址"
body =ipv6 

# 构建邮件
message = MIMEMultipart()
message["From"] = sender_email
message["To"] = receiver_email
message["Subject"] = subject

# 添加邮件正文
message.attach(MIMEText(body, "plain"))

# 发送邮件
try:
    context = ssl.create_default_context()  # 创建 SSL 上下文
    with smtplib.SMTP_SSL(smtp_server, port, context=context) as server:
        server.login(sender_email, password)  # 登录邮箱
        server.sendmail(sender_email, receiver_email, message.as_string())  # 发送邮件
    print("邮件发送成功！")
except Exception as e:
    print(f"邮件发送失败：{e}")