使用python smtplib发送邮件时，postfix会忽略CC

import smtplib
from email.mime.text import MIMEText

# 邮件内容
msg = MIMEText('这是一封测试邮件', 'plain', 'utf-8')
msg['Subject'] = '测试邮件'
msg['From'] = 'sender@example.com'
msg['To'] = 'recipient@example.com'
msg['Cc'] = 'cc_recipient@example.com'

# 发送邮件
smtp_server = 'smtp.example.com'
smtp_port = 25
smtp_username = 'your_username'
smtp_password = 'your_password'

try:
    with smtplib.SMTP(smtp_server, smtp_port) as server:
        server.login(smtp_username, smtp_password)
        server.send_message(msg)
        print('邮件发送成功')
except Exception as e:
    print('邮件发送失败:', str(e))