我建议使用

MIMEApplication代替附件.您也不需要手动执行所有有效负载编码,因为这已经自动完成.这个例子对我有用：

from email.mime.text import MIMEText

from email.mime.application import MIMEApplication

from email.utils import formataddr

from email.utils import make_msgid

from email.utils import formatdate

email = MIMEMultipart()

email['From'] = formataddr(('Jane Doe', 'jane@example.com'))

email['Subject'] = u'Test email'

email['Message-Id'] = make_msgid()

email['Date'] = formatdate(localtime=True)

email.attach(MIMEText(u'This is your email contents.'))

email.attach(MIMEApplication('your binary data'))

print email.as_string()

请注意,我还要注意在此处设置正确的Date和Message-Id标头.

将其应用于您的代码(并进行一些小的清理),我得到以下工作代码：

import smtplib

import os

from email.mime.multipart import MIMEMultipart

from email.mime.application import MIMEApplication

from email.mime.text import MIMEText

from email.utils import make_msgid

from email.utils import formatdate

def make_mail(address,body,format,mylist=[]):

msg = MIMEMultipart()

msg['To'] = address

msg['From'] = 'ggous1@gmail.com'

msg['Message-Id'] = make_msgid()

msg['Date'] = formatdate(localtime=True)

msg.attach(MIMEText(body, 'plain' if format == 'txt' else 'html'))

for filename in mylist:

part = MIMEApplication(open(filename).read())

part.add_header('Content-Disposition',

'attachment; filename="%s"' % os.path.basename(filename))

msg.attach(part)

return msg

def send_mail(msg):

srv = smtplib.SMTP('smtp.gmail.com')

srv.set_debuglevel(1)

srv.ehlo()

srv.starttls()

srv.ehlo()

srv.login('username','pass')

srv.sendmail(msg['From'], msg['To'], msg.as_string())

srv.quit()

if __name__=="__main__":

address=raw_input('Enter an address to send email in the form "name@host.com" ')

body=raw_input('Enter the contents of the email')

format=raw_input('The format is txt or html?')

question=raw_input('Do you have any files to attach?Yes or No?')

mylist=[]

if question=='Yes' or question=='yes':

fn=raw_input('Enter filename')

mylist.append(fn)

msg = make_mail(address,body,format,mylist)

send_mail(msg)