1. INTRANET MAIL SERVER (DESIGN OF SMTP and POP3)
Developed by:
E. Susheel Chandar
M. Guna Sekaran

2. About the Project
The Project comes under the area of Design of Communication Protocols
The main aim of the project is to design the two application level protocols SMTP & POP3
This Project implements the Intranet Mail Server by using the design of SMTP and POP3 protocols
Functionalities implemented
Plain Text Mails
Mails with attachment
Personal one-to-one chat
Voice Chat

3. System Analysis SMTP (Simple Mail Transfer Protocol)
SMTP is a system for sending messages to the server computer users based on addresses.
HELO or EHLO merit.edu
SMTP
CLIENT
SMTP
SERVER
220
MAIL FROM
250
RCPT TO
250
DATA
354, end with "." on a line by itself
(Welcome )
250 Mail accepted for delivery
QUIT
221

4. POP3 (Post Office Protocol Version 3.0)
POP3is used to download messages from the server to the client systems
USER
POP3
CLIENT
POP3
SERVER
+OK
PASS ********
+OK 1 Message(s) 563 Octets
LIST 1
+OK 1 563
RETR 1
+OK 563 Octets
DELE 1
+OK Message 1 Deleted
QUIT
+OK Bye

5. Mail Transfer Agent (MTA)
User Agent (UA)
The UA is a program to send and receive a mail. The UA prepares the message, creates the envelope, and puts the message in the envelope.
Mail Transfer Agent (MTA)
The MTA transfers the mail across the internet.
Multipurpose Internet Mail Extensions (MIME)
A standard for multi-part, multimedia electronic mail messages and World-Wide Web hypertext documents on the Internet. MIME provides the ability to transfer non-textual data, such as graphics, audio and fax.

6. System Design and Implementation
MODULES
Authentication Server Module
SMTP Server Module
POP3 Server Module
Chat Server Module

7. AUTHENTICATION SERVER MODULE
Functionalities
New User creation
Storage of user details in database
Password Encryption
Using Message Digest 5 Algorithm
Creation of User Mail Box
User Authentication
SMTP, POP3 and CHAT Server Integration

8. SMTP SERVER DESIGN MODULE
Functionalities of SMTP Server
Response to basic SMTP Commands from Client such as
HELO or EHLO
MAIL FROM <USER>
RCPT TO <USER>
DATA
RSET
QUIT
Storage of message from client in the appropriate Mail Box
Unread Flag updation for mails in database

9. Functionalities of SMTP Client
Transfer of commands to SMTP Server and receiving the responses from the Server.
Creation of MIME Message Headers
Creation of body part for plain text mails and attachments
Packing the Header and the Body part of the mail into a MIME Message.
Transfer of the to the server to be stored in the appropriate

10. POP3 SERVER DESIGN MODULE
Functionalities of POP3 Server
Response to basic POP3 Commands from client such as
USER username
PASS password
STAT index
LIST index
TOP message linesinbody
RETR index
QUIT
Retrieval of message(s) from the mail box of the user and send it to client.
Updation of Read Flag when retrieval of message

11. POP3 Client Functionalities
Transfer of Commands to the POP3 Server and receiving the appropriate responses.
Getting the size of the messages
Getting the Number of messages in the user mail box
Seperation of header part from the message
Seperation of the multiple body parts such as
Text
Attachments

12. Chat Server Module Functionalities Maintains the online users list
Public Chat
The message input to this window is reflected in all other client windows online
Personal Text Chat
Enables a separate chat window in both the client systems and the message access is prevented for other users
Voice Chat
Similar to personal chat, initiates two voice chat windows in the client ends and transmits voice.

13. Results obtained

15. Future Enhancements
To include the facility of attachment of folders with the electronic mail, which is not in use in the present systems.

16. THANK YOU