python发邮件

# -*- coding:utf- -*- 

import smtplib,os,sys,string
import mimetypes
from email import Encoders
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
from email.MIMEMultipart import MIMEMultipart
from email.MIMEImage import MIMEImage
import time
import datetime

mail_host="smtp.126.com"
mail_user="用户名"
mail_pass="授权码，不是网页登录密码"
mail_postfix="126.com"

to_list="a@126.com;b@126.com;"
today=datetime.date.today()
oneday=datetime.timedelta(days=)
yesterday=today-oneday
sub="[数据中心]" + yesterday.strftime('%Y-%m-%d') + "新增账号数据"
content="每日注册用户。请查阅附件。"
attachment_list="m.txt"
######################

def send_mail():
    me=mail_user+"<"+mail_user+"@"+mail_postfix+">"
    msgRoot = MIMEMultipart()
    msg = MIMEText(content,'html',_charset='utf8')
    msgRoot['Subject'] = sub
    msgRoot['From'] = me
    msgRoot['To'] = to_list
    inputfilename_list=attachment_list.split(',')
    try:
          msgRoot.attach(msg)
          #for inputfilename in mailattachlist:
      for inputfilename in inputfilename_list:
        if inputfilename:
            basename=os.path.basename(inputfilename)
            att = MIMEText(open(inputfilename, 'rb').read(), 'base64', 'utf8')
            att["Content-Type"] = 'application/octet-stream'
            att["Content-Disposition"] = 'attachment; filename="'+basename+'"'
            msgRoot.attach(att)

          s = smtplib.SMTP()
          #s.set_debuglevel()
          s.connect(mail_host)

          s.login(mail_user,mail_pass)
          #s.ehlo()
          #s.starttls()
          s.sendmail(me, string.splitfields(to_list,";"), msgRoot.as_string())
          s.close()
          return True
    except Exception, e:
        print str(e)
        print inputfilename
        return False

if send_mail():
        print 'ok'
else:
        print 'false'