从分发邮件id[Python]发送邮件时出现问题

Question

我看到了下面的问题，但仍有一些疑问。

Sending an email from a distribution list

首先，我有一个单独的邮件帐户以及一个用于特定邮件服务器中的组的分发id。通过指定From字段，我可以通过outlook从分发邮件id发送邮件。它不需要身份验证。

我一直在使用以下代码通过我的个人帐户发送邮件：

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
import os


FROMADDR = "myaddr@server.com"
GROUP_ADDR = ['group@server.com']
PASSWORD = 'foo'


TOADDR   = ['toaddr@server.com']
CCADDR   = ['group@server.com']

# Create message container - the correct MIME type is multipart/alternative.
msg            = MIMEMultipart('alternative')
msg['Subject'] = 'Test'
msg['From']    = FROMADDR
msg['To']      = ', '.join(TOADDR)
msg['Cc']      = ', '.join(CCADDR)

# Create the body of the message (an HTML version).
text = """Hi  this is the body
"""

# Record the MIME types of both parts - text/plain and text/html.
body = MIMEText(text, 'plain')

# Attach parts into message container.
msg.attach(body)

# Send the message via local SMTP server.
s = smtplib.SMTP('server.com', 587)
s.set_debuglevel(1)
s.ehlo()
s.starttls()
s.login(FROMADDR, PASSWORD)
s.sendmail(FROMADDR, TOADDR, msg.as_string())
s.quit()

这很好用。由于我可以通过outlook从分发邮件id发送邮件（无需任何密码），是否可以修改此代码以通过分发id发送邮件？我试着评论

s.ehlo()
s.starttls()
s.login(FROMADDR, PASSWORD)

但代码给出了以下错误：

send: 'mail FROM:<group@server.com> size=393\r\n'
reply: b'530 5.7.1 Client was not authenticated\r\n'
reply: retcode (530); Msg: b'5.7.1 Client was not authenticated'
send: 'rset\r\n'
Traceback (most recent call last):
  File "C:\Send_Mail_new.py", line 39, in <module>
    s.sendmail(FROMADDR, TOADDR, msg.as_string())
  File "C:\Python32\lib\smtplib.py", line 743, in sendmail
    self.rset()
  File "C:\Python32\lib\smtplib.py", line 471, in rset
    return self.docmd("rset")
  File "C:\Python32\lib\smtplib.py", line 395, in docmd
    return self.getreply()
  File "C:\Python32\lib\smtplib.py", line 371, in getreply
    raise SMTPServerDisconnected("Connection unexpectedly closed")
smtplib.SMTPServerDisconnected: Connection unexpectedly closed

有人能帮我吗？