Python之SMTP 发邮件，pythonsmtp发邮件,这段代码解释了SMTP在

Python之SMTP 发邮件，pythonsmtp发邮件,这段代码解释了SMTP在

这段代码解释了SMTP在python中的基本应用。获得服务器的特性，如：允许发送的邮件大小。查看服务器是否支持SSL和TLS安全传输。查看在发送邮件之前是否需要认证。参考链接：http://blog.sina.com.cn/kaiyongdeng 参考链接：http://zhan.renren.com/pythonfocus

[Python]代码

#!/usr/bin/env python#-*-coding = UTF-8-*-#SMTP_email.py#auth@:xfk#date@:2012-04-30import sysimport smtplibimport socketfrom getpass import getpassif 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: %sFrom: %sSubject: Test Message from SMTP_mail.pyHello ,This a simple SMTP_mail example.""" % (','.join(toaddr),fromaddr)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.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()