请教：发邮件发送代码有错误，被服务器拒收，我找不到问题出在哪里

def sendfile(filepath):

from_mail=‘**@163.com’

to_mail=‘**@qq.com’

msg=MIMEMultipart()

msg[‘From’]=from_mail

msg[‘To’]=to_mail

msg[‘Subject’]=’subject’

content=MIMEText(open(filepath, ‘r’).read(), ‘base64’, ‘gb2312’)

content[“Content-Type”] = ‘application/octet-stream’

content.add_header(‘content-disposition’,’attachment’,filename=filepath)

msg.attach(content)

server=smtplib.SMTP(‘smtp.163.com’)

server.docmd(‘ehlo’,‘**@163.com’)

server.login(‘@163.com’,’**‘)

server.sendmail(from_mail,to_mail,msg.as_string())

server.quit()

def sendall():

for root, dirs, files in os.walk(‘D:/foolbak/‘):

for one in files:

tempfile=root+’/‘+one

sendfile(tempfile)

time.sleep(30)