pythonsmtp_Python之SMTP学习笔记方法详解

这是关于SMTP在python中的基本应用，一个学习python的爱好者的学习笔记。需要用到python sys、python smtplib、python socket等方法。

Python之SMTP学习笔记方法详解：

(1)首先，获得服务器的特性，如：允许发送的邮件大小；

(2)接着，查看服务器是否支持SSL和TLS安全传输；

(3)最后，查看在发送邮件之前是否需要认证。

#!/usr/bin/env python

#-*-coding = UTF-8-*-

import sys

import smtplib

import socket

from getpass import getpass

if len(sys.argv) < 4:

print "[*]usage:%s server fromaddr toaddr " % sys.argv[0]

sys.exit(1)

server = sys.argv[1]

fromaddr = sys.argv[2]

toaddr = sys.argv[3]

message = """

TO: %s

From: %s

Subject: Test Message from SMTP_mail.py

Hello ,This a simple SMTP_mail example.

""" % (','.join(toaddr),fromaddr)

#www.iplaypy.com

def get_size():

"""获得服务器允许发送邮件的大小"""

try:

s = smtplib.SMTP(server) #连接到服务器

code = s.ehlo()[0] #返回服务器的特性

usesesmtp = 1

if not (200 <= code <=299): #在200到299之间都是正确的返回值

usesesntp = 0

code = s.helo()[0]

if not (200 <= code <=299):

raise SMTPHeloError(code,resp)

if usesesmtp and s.has_extn('size'): #获得服务器允许发送邮件的大小

print "Maxinum message size is ",s.esmtp_features['size']

if len(message) > int(s.esmtp_features['size']):

print "Message too large;aborting."

sys.exit(2)

s.sendmail(fromaddr,toaddr,message)

except(socket.gaierror,socket.error,socket.herror,smtplib.SMTPException),e:

print "***Your message may not have been sent!"

print e

sys.exit(1)

else:

print "***Message successful sent to %d recipient(s)" % len(toaddr)

def ssl_tls():

"""使用SSL安全套阶层和TLS安全传输层进行邮件传输，确保密码在传输中的安全"""

try:

s = smtplib.SMTP(server) #连接到服务器

code = s.ehlo()[0] #返回服务器的特性

usesesmtp = 1

if not (200 <= code <=299): #在200到299之间都是正确的返回值

usesesntp = 0

code = s.helo()[0]

if not (200 <= code <=299):

raise SMTPHeloError(code,resp)

if usesesmtp and s.has_extn('starttls'): #查看服务器是否支持TLS

print "Negotiating TLS......"

s.starttls()

code = s.ehlo()[0]

if not (200 <= code <=299): #在支持TLS的服务器上是否连接回话成功

print "Couldn't EHLO after STARTTLS."

sys.exit(5)

print "Using TLS connection."

else:

print "Server does not suport TLS; using normal connection."

s.sendmail(fromaddr,toaddr,message) #如果连接TLS成功则使用加密传输；若连接TLS出错则使用普通的传输

except(socket.gaierror,socket.error,socket.herror,smtplib.SMTPException),e:

print "***Your message may not have been sent!"

print e

sys.exit(1)

else:

print "***Message successful sent to %d recipient(s)" % len(toaddr)

def auth_login():

"""当发送邮件时，服务器需要验证，则输入用户名密码方可发送邮件"""

sys.stdout.write("Enter username: ")

username = sys.stdin.readline().strip()

password = getpass("Enter password: ")

try:

s = smtplib.SMTP(server) #连接到服务器

code = s.ehlo()[0] #返回服务器的特性

usesesmtp = 1

if not (200 <= code <=299): #在200到299之间都是正确的返回值

usesesntp = 0

code = s.helo()[0]

if not (200 <= code <=299):

raise SMTPHeloError(code,resp)

if usesesmtp and s.has_extn('auth'): #查看服务器是否支持认证

print "Using Authentication connect."

try:

s.login(username,password)

except smtplib.SMTPException,e:

print "Authentication failed:",e

sys.exit(1)

else:

print "Server does not suport Authentication; using normal connect."

s.sendmail(fromaddr,toaddr,message) #如果支持认证则输入用户名密码进行认证；不支持则使用普通形式进行传输

except(socket.gaierror,socket

2000

.error,socket.herror,smtplib.SMTPException),e:

print "***Your message may not have been sent!"

print e

sys.exit(1)

else:

print "***Message successful sent to %d recipient(s)" % len(toaddr)

if __name__ == "__main__":

get_size()

ssl_tls()

auth_login()

玩蛇网文章，转载请注明出处和文章网址：https://www.iplaypy.com/code/base/b2248.html

相关文章 Recommend