如何发送多封电子邮件？

import smtplib
from email.mime.text import MIMEText

def send_email(sender, receiver, subject, message):
    # 配置邮件内容
    msg = MIMEText(message)
    msg['Subject'] = subject
    msg['From'] = sender
    msg['To'] = receiver

    # 连接邮件服务器并发送邮件
    with smtplib.SMTP('smtp.example.com', 587) as server:
        server.login('your_username', 'your_password')
        server.sendmail(sender, receiver, msg.as_string())

# 发送多封邮件
send_email('sender@example.com', 'receiver1@example.com', 'Subject 1', 'Message 1')
send_email('sender@example.com', 'receiver2@example.com', 'Subject 2', 'Message 2')
send_email('sender@example.com', 'receiver3@example.com', 'Subject 3', 'Message 3')