PYTHON发送邮件时，有的服务器不用密码认证的

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#!/usr/bin/python

# coding: UTF-8

import smtplib

from email.mime.text import MIMEText

receivers_list=["chengang@example.com",]

#mail_host="dns.com"

mail_host="1.2.3.4"

sender_email="send@bat.com"

#mail_pwd="*************" //有的需要，有的不需要

def send_email(subject, content, receivers_list):

    print 'Setting MIMEText'

    msg = MIMEText(content.encode('utf8'), _subtype = 'html', _charset = 'utf8')

    msg['From'] = sender_email

    msg['Subject'] = u'%s' % subject

    msg['To'] = ",".join(receivers_list)

    try:

        # s = smtplib.SMTP_SSL(mail_host, 465) //有的需要，有的不需要

        s = smtplib.SMTP(mail_host, 25)

        # s.connect(mail_host) //和上面的连接任选一种

        #s.set_debuglevel(1)

        #s.ehlo() //有的需要，有的不需要

        #s.starttls() //有的需要，有的不需要

        #s.ehlo()

        #s.login(mail_user, mail_pwd) //有的需要，有的不需要

        s.sendmail(sender_email, receivers_list, msg.as_string())

        print 'close the connection between the mail server'

        s.close()

    except Exception as e:

        print 'Exception: ', e

if __name__ == '__main__':

    send_email("subject title", 'email content', receivers_list)