邮箱如何更改域名

import imaplib
import email
from email.header import decode_header

def migrate_emails(old_email, old_password, new_email, new_password):
    # 连接到旧邮箱服务器
    old_mail = imaplib.IMAP4_SSL('imap.oldprovider.com')
    old_mail.login(old_email, old_password)
    old_mail.select('inbox')

    # 连接到新邮箱服务器
    new_mail = imaplib.IMAP4_SSL('imap.newprovider.com')
    new_mail.login(new_email, new_password)
    new_mail.create('inbox')

    # 获取旧邮箱中的邮件
    _, data = old_mail.search(None, 'ALL')
    mail_ids = data[0].split()

    for mail_id in mail_ids:
        _, msg_data = old_mail.fetch(mail_id, '(RFC822)')
        for response_part in msg_data:
            if isinstance(response_part, tuple):
                msg = email.message_from_bytes(response_part[1])
                subject, encoding = decode_header(msg['Subject'])[0]
                if isinstance(subject, bytes):
                    subject = subject.decode(encoding or 'utf-8')
                print(f'Migrating email: {subject}')
                new_mail.append('inbox', None, None, msg.as_bytes())

    old_mail.logout()
    new_mail.logout()

# 示例调用
migrate_emails('olduser@olddomain.com', 'oldpassword', 'newuser@newdomain.com', 'newpassword')