python smtp发送邮件

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def send_mail(receiver, subject, body):    print "send mail: ", subject    sender = '[e-mail]'    m = MIMEMultipart()    m['to'] = receiver    m['from'] = sender    m['subject'] = subject    m.attach(MIMEText(body, 'html', 'utf-8'))    #print m.as_string()    s = smtplib.SMTP()    s.connect()    s.sendmail(sender, [receiver], m.as_string())    s.close()