python向多個郵箱發郵件--注意接收是垃圾郵件

群發郵件注意：三處標紅的地方

# -*- 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 服務
mail_host="smtp.qq.com"  #設置服務器
mail_user="[e-mail]"    #用戶名
mail_pass="xxxxxx"   #口令



sender = '[e-mail]'
receivers = ['[e-mail]','[e-mail]','[e-mail]','[e-mail]','[e-mail]','[e-mail]']  # 接收郵件，可設置為你的QQ郵箱或者其他郵箱
 
 
msgRoot = MIMEMultipart('related')
msgRoot['From'] = Header("發送人", 'utf-8')
msgRoot['To'] =  ','.join(receivers)#注意
subject = '主題'
msgRoot['Subject'] = Header(subject, 'utf-8')
 
msgAlternative = MIMEMultipart('alternative')
msgRoot.attach(msgAlternative)
 
 
mail_msg = """
發送信息內容
"""
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 "郵件發送成功"
except smtplib.SMTPException:
    print "Error: 無法發送郵件"