smtplib 无法发送邮件：550 5.7.1 此系统配置为拒绝欺骗的发件人地址

Question

我收到一条错误邮件：　　

User_One@mycompany.com
Your message wasn't delivered due to a permission or security issue. 
It may have been rejected by a moderator, the address may only accept e-mail     
from certain senders, or another restriction may be preventing delivery.

smtp; 550 5.7.1 This system is configured to reject spoofed sender addresses> #SMTP#
Original message headers:
Return-Path: <User_One@mycompany.com>
Received: from  localhost.localdomain (unknown [192.X.X.X]) (using
 TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits))  (No client
 certificate requested) by smtpcompany.tw (Postfix) with ESMTPS id CB8752E03B7  for
 <User_One@mycompany.com>; Fri,  2 Oct 2015 14:24:41 +0800 (CST)
Content-Type: multipart/mixed; boundary="===============1672092220=="
MIME-Version: 1.0
From: <User_One@mycompany.com>
To: <User_One@mycompany.com>
Subject: We got something

我坚持了一段时间 不知道哪里错了
我试试smtplib.SMTP('smtp.gmail.com',587) 效果很好
但公司 smtp 失败
我认为这条线很奇怪：

 Received: from  localhost.localdomain (unknown [192.X.X.X])  

你有什么想法吗？
请帮帮我谢谢

代码如下：

def send_email(mail_from,mail_to,subject, body):
    import smtplib
    from email.mime.multipart import MIMEMultipart
    fromaddr = mail_from
    toaddr = mail_to if type(mail_to) is list else [mail_to]
    msg = MIMEMultipart()
    msg['From'] = fromaddr
    msg['To'] = ", ".join(toaddr)
    msg['Subject'] = subject
    body = body
    server = smtplib.SMTP('mail.stmpcompany.tw', 25)      
    server.set_debuglevel(True)
    server.starttls()
    text = msg.as_string()
    server.sendmail(fromaddr, toaddr, text)
    server.quit()

Answer 1

您的发件人地址（来自电子邮件中的字段）必须是您使用的邮件服务器 (mail.stmpcompany.tw) 上的现有电子邮件地址。

错误信息

5.7.1 此系统配置为拒绝伪造的发件人地址

当您在 from 字段中使用的电子邮件地址不属于为邮件服务器配置的域或服务器还要求具有该电子邮件地址的用户实际存在时，就会发生这种情况。

您对 gmail 的测试有效，因为 google 的邮件服务器不会检查发件人地址是否有效。