使用python socket实现smtp协议，出现了神奇的问题

[xuzheng00]

问题在于虚线之间，用户信息验证不通过，我仔细检查过协议里登录的格式，没有发现问题。我163邮箱已经开启了smtp服务，密码也用的是服务密码。由于只是实验用的邮箱，服务密码没有屏蔽，大佬可以拿去试一下= =难道现在smtp邮件已经改了发送方式吗？= =

from socket import *           
import base64

msg = "\r\n I Love Computer Networks!"                                  #Declarations
endmsg="\r\n.\r\n"
mailfrom = "MAIL FROM:<[e-mail]>\r\n"
rcptto="RCPT TO:<[e-mail]>\r\n"
data = "DATA\r\n"
quitmsg="QUIT\r\n"

#Choose a mail server (e.g. Google mail server) and call it mailserver
mailserver="smtp.163.com"                                               #Use the local Host as SMTP Server
mailPort=25                                                           #Specify Port For Local SMTP
connectaddress=(mailserver,mailPort)

#Create socket called clientsocket and establish a TCP connection with mailserver
clientSocket=socket(AF_INET,SOCK_STREAM)                                #Assign IP address and port number
clientSocket.connect(connectaddress)                                    #Connect to Local SMTP
recv=clientSocket.recv(1024)
print(recv)
if recv[:3].decode()!='220':                                            #Print Error Clause
    print("220 reply not received from server")

#Send HELO command and print server response.
heloCommand="HELO Alice\r\n"
clientSocket.send(bytes(heloCommand.encode()))
recv1=clientSocket.recv(1024)
print(recv1.decode())
if recv1.decode()[:3]!="250":
    print("250 reply not received from server.")

print('-----------------------------------')

loginini = b'AUTH LOGIN\r\n'
userCommand = base64.b64encode(b'[e-mail]\r\n') 
passwordCommand = base64.b64encode(b'xudoudou3661615\r\n') 
clientSocket.send(loginini)
recv2 = clientSocket.recv(1024).decode('utf-8')
print('222+ ',recv2)

clientSocket.send(userCommand)
recv3 = clientSocket.recv(1024).decode('utf-8')
print('333+ ',recv3)

clientSocket.send(passwordCommand)
recv4 = clientSocket.recv(1024).decode('utf-8')
print('444+ ',recv4)
print('-----------------------------------')
#Send MAIL FROM command and print server response.
clientSocket.send(bytes(mailfrom.encode()))                             #send mail, had to convert to bytes
check=clientSocket.recv(1024)
print(check)                                                            #print confirmation of working messages

#Send RCPT TO command and print server response.
clientSocket.send(bytes(rcptto.encode()))                               #recieve, had to convert to bytes
check1=clientSocket.recv(1024)
print(check1)                                                           #print confirmation of working messages

#Send DATA command and print server response.
clientSocket.send(bytes(data.encode()))                                 #DATA, had to convert to bytes
check2=clientSocket.recv(1024)
print(check2)                                                           #print confirmation of working messages

#Message ends with a single period.
clientSocket.send(bytes((mailfrom+msg+endmsg).encode()))                #Concatinate bits for message
check3=clientSocket.recv(1024)
print(check3)                                                           #print confirmation of working messages

#Send QUIT command and get server response.
clientSocket.send(bytes(quitmsg.encode()))                              #Quit the session
check4=clientSocket.recv(1024)
print(check4)          

[xuzheng00]

终端： b'220 163.com Anti-spam GT for Coremail System (163com[20141201])\r\n' 250 OK ----------------------------------- 222+ 334 dXNlcm5hbWU6 会停在这里 单步调试发现会停在发送登录用户名时返回的信息那里

[xuzheng00]

[oyljerry]

anti spam。看上去是你发送的邮件被服务器认为是垃圾邮件了

[xuzheng00]

啊为什么会被认定为垃圾邮件？我这段代码运行到登录认证部分就卡住了，内容部分在登录部分下面，还没有运行到。我用python的smtplib模块发邮件可以成功发送

[xuzheng00]

引用 4 楼 oyljerry的回复:

anti spam。看上去是你发送的邮件被服务器认为是垃圾邮件了

啊为什么会被认定为垃圾邮件？因为ip的原因？我这段代码运行到登录认证部分就卡住了，内容部分在登录部分下面，还没有运行到。我用python的smtplib模块发邮件可以成功发送

[REDSENET]

userCommand = base64.b64encode(b'[e-mail]\r\n') 
passwordCommand = base64.b64encode(b'xudoudou3661615\r\n')

改成

userCommand = base64.b64encode(b'[e-mail]')+'\r\n'
passwordCommand = base64.b64encode(b'xudoudou3661615')+'\r\n'

应该就可以了

[王大凤]

其实上一个人说的是对的啊，但是因为bytes不能和str相加，所以先把bytes转成str再相加，发送的时候再userCommand.encode()就可以了。我这样之后就可以显示authentificaion successfully啦。

userCommand = base64.b64encode(b'[e-mail]').decode()+'\r\n'
passwordCommand = base64.b64encode(b'xudoudou3661615').decode()+'\r\n'