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from socket import *
import base64
# Mail content
subject = "I love computer networks!"
contenttype = "text/plain"
msg = "I love computer networks!"
endmsg = "\r\n.\r\n"
# Choose a mail server (e.g. Google mail server) and call it mailserver
mailserver = "smtp.163.com"
# Sender and reciever
fromaddress = "******@163.com"
toaddress = "******@qq.com"
# Auth information (Encode with base64)
username = base64.b64encode(fromaddress.encode()).decode()
password = base64.b64encode("******".encode()).decode()
# Create socket called clientSocket and establish a TCP connection with mailserver
clientSocket = socket(AF_INET, SOCK_STREAM)
clientSocket.connect((mailserver, 25))
recv = clientSocket.recv(1024).decode()
print(recv)
if recv[:3] != '220':
print('220 reply not received from server.')
# Send HELO command and print server response.
heloCommand = 'HELO Alice\r\n'
clientSocket.send(heloCommand.encode())
recv1 = clientSocket.recv(1024).decode()
print(recv1)
if recv1[:3] != '250':
print('250 reply not received from server.')
# Auth
clientSocket.sendall('AUTH LOGIN\r\n'.encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if (recv[:3] != '334'):
print('334 reply not received from server')
clientSocket.sendall((username + '\r\n').encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if (recv[:3] != '334'):
print('334 reply not received from server')
clientSocket.sendall((password + '\r\n').encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if (recv[:3] != '235'):
print('235 reply not received from server')
# Send MAIL FROM command and print server response.
clientSocket.sendall(('MAIL FROM: <' + fromaddress + '>\r\n').encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if (recv[:3] != '250'):
print('250 reply not received from server')
# Send RCPT TO command and print server response.
clientSocket.sendall(('RCPT TO: <' + toaddress + '>\r\n').encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if (recv[:3] != '250'):
print('250 reply not received from server')
# Send DATA command and print server response.
clientSocket.send('DATA\r\n'.encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if (recv[:3] != '354'):
print('354 reply not received from server')
# Send message data.
message = 'from:' + fromaddress + '\r\n'
message += 'to:' + toaddress + '\r\n'
message += 'subject:' + subject + '\r\n'
message += 'Content-Type:' + contenttype + '\t\n'
message += '\r\n' + msg
clientSocket.sendall(message.encode())
# Message ends with a single period.
clientSocket.sendall(endmsg.encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if (recv[:3] != '250'):
print('250 reply not received from server')
# Send QUIT command and get server response.
clientSocket.sendall('QUIT\r\n'.encode())
# Close connection
clientSocket.close()
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