文本内容：

#!/usr/bin/env python
# -*- coding=utf-8 -*-

import smtplib
from email.mime.text import MIMEText

def send_mail(to_list,sub,content):
    mail_host = "***"  # 设置服务器
    mail_user = "***"  # 用户名
    mail_pass = "***"  # 口令
    mail_postfix = "***"  # 发件箱的后缀
    mail_port = ***  # 端口

    sender="Alerter"+"<"+mail_user+"@"+mail_postfix+">"
    msg = MIMEText(content,_subtype='plain',_charset='utf-8')
    msg['Subject'] = sub
    msg['From'] = sender
    msg['To'] = ";".join(to_list)
    try:
        server = smtplib.SMTP()
        server.connect(mail_host, mail_port)
        server.login(mail_user, mail_pass)
        server.sendmail(sender, to_list, msg.as_string())
        server.close()
        return True
    except Exception, e:
        print str(e)
        return False

if __name__ == '__main__':
    subject='text_test'
    send_content = ''
    mailto_list=['***@163.com',...]

    send_mail(mailto_list, subject, send_content)

html 内容：

def send_mail(to_list,sub,content):
    mail_host = "***"  # 设置服务器
    mail_user = "***"  # 用户名
    mail_pass = "***"  # 口令
    mail_postfix = "***"  # 发件箱的后缀
    mail_port = ***  # 端口

    sender="Alerter"+"<"+mail_user+"@"+mail_postfix+">"
    msg = MIMEText(content,_subtype='html',_charset='utf-8')
    msg['Subject'] = sub
    msg['From'] = sender
    msg['To'] = ";".join(to_list)
    try:
        server = smtplib.SMTP()
        server.connect(mail_host, mail_port)
        server.login(mail_user, mail_pass)
        server.sendmail(sender, to_list, msg.as_string())
        server.close()
        return True
    except Exception, e:
        print str(e)
        return False