INTRANET MAIL SERVER (DESIGN OF SMTP and POP3)

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 e-mail addresses. HELO or EHLO merit.edu SMTP CLIENT SMTP SERVER 220 MAIL FROM <guna@merit.edu> 250 RCPT TO <susheel@merit.edu> 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 susheel@merit.edu POP3 CLIENT POP3 SERVER +OK susheel@merit.edu 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. 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 e-mail 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 email 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 email 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 email 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