购买域名为什么要续费

import smtplib
from email.mime.text import MIMEText
from datetime import datetime, timedelta

# 配置
domain = "example.com"
expiry_date = datetime(2024, 1, 1)  # 假设域名到期日期
email_from = "your_email@example.com"
email_to = "recipient_email@example.com"
smtp_server = "smtp.example.com"
smtp_port = 587
smtp_username = "your_smtp_username"
smtp_password = "your_smtp_password"

# 检查续费日期
today = datetime.now()
days_until_expiry = (expiry_date - today).days

if days_until_expiry <= 30:
    # 发送提醒邮件
    msg = MIMEText(f"Your domain {domain} will expire in {days_until_expiry} days. Please renew it.")
    msg['Subject'] = 'Domain Expiry Reminder'
    msg['From'] = email_from
    msg['To'] = email_to

    server = smtplib.SMTP(smtp_server, smtp_port)
    server.starttls()
    server.login(smtp_username, smtp_password)
    server.sendmail(email_from, email_to, msg.as_string())
    server.quit()

print("Domain expiry check completed.")