域名过期预订是什么意思

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

def check_domain_expiration(domain):
    w = whois.whois(domain)
    expiration_date = w.expiration_date
    if isinstance(expiration_date, list):
        expiration_date = expiration_date[0]
    days_until_expiration = (expiration_date - datetime.now()).days
    return days_until_expiration

def send_reminder_email(domain, days_until_expiration):
    msg = MIMEText(f"Domain {domain} will expire in {days_until_expiration} days.")
    msg['Subject'] = 'Domain Expiration Reminder'
    msg['From'] = 'your_email@example.com'
    msg['To'] = 'recipient_email@example.com'

    smtp_server = smtplib.SMTP('smtp.example.com', 587)
    smtp_server.login('your_email@example.com', 'your_password')
    smtp_server.send_message(msg)
    smtp_server.quit()

domain = 'example.com'
days_until_expiration = check_domain_expiration(domain)
if days_until_expiration < 30:
    send_reminder_email(domain, days_until_expiration)