邮件未发送给 CC 中的人

I have the following script for sending mails using python

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

FROMADDR = "myaddr@server.com"
PASSWORD = 'foo'

TOADDR   = ['toaddr1@server.com', 'toaddr2@server.com']
CCADDR   = ['ccaddr1@server.com', 'ccaddr2@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()

当我使用脚本时，我看到邮件同时发送到 toaddr1 和 toadd2但是 ccaddr1 和 ccaddr2 根本没有收到邮件.

s.sendmail(FROMADDR, TOADDR+CCADDR, msg.as_string())