Mail Pilot 3 0 (4488) – Task Oriented Email Client

OVERVIEW:

• Mail Pilot 3 0 (4488) – Task Oriented Email Client Example
• Mail Pilot 3 0 (4488) – Task Oriented Email Clients

For this assignment I created a simple mail client that sends an email to a recipient. My client establishes a TCP connection with a mail server, exchanges with the mail server using the SMTP protocol, sends an email to a recipient via the mail server, then finally closes the TCP connection with the mail server. To test this, I send an email to myself and examine the results. Videocompressor 2017 1 1.

CLIENT CODE:

For this assignment I was able to adapt my code by referencing a combination of the skeleton code provided by the Computer Networking A Top Down Approach student resources, section 2.4.1 of the same book, and RFC 2821.

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#——————————————————————————-
# Name: mailclient.py
# Purpose: SMTP Mail Client
#
# Author: Jeff Lee
#
# Created: 30/10/2013
# Copyright: (c) Jeff 2013
# Licence:
#——————————————————————————-
from socket import *

def main():
msg='rn I love computer networks!' # message to be sent in email body
endmsg='rn.rn' # message which will signal end of message
mailServer ='localhost' # free SMTP Server host
clientSocket = socket(AF_INET, SOCK_STREAM) # create socket
clientSocket.connect((mailServer, 25)) # establish TCP connection with mail server
recv=clientSocket.recv(1024) # the data that clientsocket recieves
print recv # print data recieved (expecting Ready Code and name of server)
if recv[:3]!='220′: # if ready code not recieved
print ‘220 reply not received from server.' # print error mssg

#Send HELO command and print server response.
heloCommand='HELO Localhostrn' # helo command to server
clientSocket.send(heloCommand) # send helo command (initiate handshake)
recv1=clientSocket.recv(1024) # response from server
print recv1 # print respone (expecting Action Completed Code + Hello response mssg)
if recv1[:3]!='250′: # if action completed code not recieved
print ‘250 reply not received from server.' # print error mssg

#Send MAIL FROM command and print server response.
clientSocket.send(‘MAIL FROM: rn') # send who is supposedly sending the email
recv1 = clientSocket.recv(1024) # data that is recieved back
print recv1 # print data (expecting Action Completed Code + confirmation of valid from address)
if recv1[:3] != ‘250': #if the data is not received # if action completed code not recieved
print ‘250 reply not received from server.' # print error mssg

#Send RCPT TO command and print server response.
clientSocket.send(‘RCPT TO: rn') # send who will recieve the email
recv1 = clientSocket.recv(1024) # data recieved back
print recv1 # print data (expecting Action Completed Code + confirmation of valid to address)
if recv1[:3] != ‘250': # if action completed code not recieved
print ‘250 reply not received from server.' # print error mssg

#Send DATA command and print server response.
clientSocket.send(‘DATArn') # send the data command
recv1 = clientSocket.recv(1024) # data that is recieved back
print recv1 # print data (should be Mail Input code 354….)
if recv1[:3] != ‘354': # if 354 code not received
print ‘250 reply not received from server.' # print error mssg

#Send message data.
clientSocket.send(msg) # send message to be sent in the email body

#Message ends with a single period.
clientSocket.send(endmsg) # signal end of email message
recv1 = clientSocket.recv(1024) # response back
print recv1 # print response (expecting Action Completed Code + OK as reply to DATA)
if recv1[:3] != ‘250': # if not as expected
print ‘250 reply not received from server.' # print error mssg

#Send QUIT command and get server response.
clientSocket.send(‘QUITrn') # send QUIT command
clientSocket.close() # close socket

pass

if __name__ ‘__main__':
main()

CODE BREAKDOWN:

In my code I .

1) Specify the message that will be send in the email

2) Specify the mail server

3) Create a connection to the server and print the server's reply (or an error if there's a problem)

4) Handshake by sending HELO and receiving server reply… (and print reply or error)

5) Send Mail FROM field and receive acknowledge from the server.(and print reply or error)

6) Send RCPT TO: field and receive acknowledge from the server.(and print reply or error)

7) Send DATA command and receive reply from the server.(and print reply or error)

8) Finally…now the email body message which we declared in step 1 is sent

9) After the message is finished we send an isolated period to signal the end of our email. Then the server replies with a confirmation or error (which I print).

10) And at last…the QUIT command is sent and we close the connection.

PREPARING SMTP SERVER

To test my implementation I used my own free SMTP server which I was able to download from softstack.com as pictured here: Does directv have an apple tv app.

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Now the server is running and I can begin to test my client.

RUNNING & TESTING THE CLIENT:

To test my implementation, all I need to do is run it… as I've already specified everything it needs to send an email In it. If successful I should ultimately receive an email at my hotmail email address seemingly from my school email address… and at every step along the way my client should have printed out a record of the responses that the server sent back to it.

FREE SMTP SERVER ACTIVITY PROOF

When the client code is run if you look into the Free SMTP Server window you will see the resulting connection listed under Active Connections… unfortunately for photo purposes this happens pretty fast so I was unable to get a screenshot of this in action but the following illustrates what you could expect:

CLIENT RECORD OF MAIL SERVER REPLIES

Here, at the bottom, you can see the recorded reply messages (that the server sent according to SMTP protocol) are as expected:

EMAIL PROOF

And finally checking the email which the mail was meant to be sent to, I see that the email message was in fact delivered properly with all the correct parameters.

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The above solution worked without issue, but here's an example just to show would happen had the server encountered something unexpected. In this case it just so happens that my Free SMTP Server only allows a small number of messages to be sent per day…. so what happens when that limit is exceeded? … In this screenshot you can see from the printed record of replies from the server that the email isn't successfully delivered and an error code and message is displayed accordingly and so nothing arrives in my inbox.

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• Release notes not available at the time of this post.

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