python向多个邮箱发邮件--注意接收是垃圾邮件

群发邮件注意：三处标红的地方

# -*- coding: UTF-8 -*-
 
import smtplib

from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.header import Header
from email.mime.image import MIMEImage


# 第三方 SMTP 服务
mail_host="smtp.qq.com"  #设置服务器
mail_user="xxx@qq.com"    #用户名
mail_pass="xxxxxx"   #口令



sender = \'xxx@qq.com\'
receivers = [\'123@qq.com\',\'456@qq.com\',\'789@qq.com\',\'987@qq.com\',\'546@qq.com\',\'321@qq.com\']  # 接收邮件，可设置为你的QQ邮箱或者其他邮箱
 
 
msgRoot = MIMEMultipart(\'related\')
msgRoot[\'From\'] = Header("发送人", \'utf-8\')
msgRoot[\'To\'] =  \',\'.join(receivers)#注意
subject = \'主题\'
msgRoot[\'Subject\'] = Header(subject, \'utf-8\')
 
msgAlternative = MIMEMultipart(\'alternative\')
msgRoot.attach(msgAlternative)
 
 
mail_msg = """
发送信息内容
"""
msgAlternative.attach(MIMEText(mail_msg, \'html\', \'utf-8\'))
 


 
try:
    smtpObj = smtplib.SMTP_SSL(mail_host, 465)
    smtpObj.login(mail_user,mail_pass)
    smtpObj.sendmail(sender, receivers, msgRoot.as_string())
    print "邮件发送成功"
except smtplib.SMTPException:
    print "Error: 无法发送邮件"