Python smtplib:如何发送看起来像从电子邮件帐户发送的电子邮件的消息

import smtplib

smtp_server = 'smtp.example.com'  # SMTP服务器地址
smtp_port = 587  # SMTP服务器端口号
smtp_username = 'your_username'  # 邮箱账户用户名
smtp_password = 'your_password'  # 邮箱账户密码

smtp_obj = smtplib.SMTP(smtp_server, smtp_port)
smtp_obj.starttls()  # 启用TLS加密
smtp_obj.login(smtp_username, smtp_password)  # 登录邮箱账户

from email.mime.text import MIMEText

sender = 'sender@example.com'  # 发件人邮箱地址
receiver = 'receiver@example.com'  # 收件人邮箱地址
subject = '邮件主题'
message = '邮件内容'

msg = MIMEText(message)
msg['Subject'] = subject
msg['From'] = sender
msg['To'] = receiver

smtp_obj.sendmail(sender, receiver, msg.as_string())

smtp_obj.quit()