Wireshark 2 Quick Start Guide

Dissecting SMTP communication packets

Using the Netcat client from a Kali Linux machine, I will connect to the SMTP mail service running on a Windows machine. After a successful three-way handshake, the server will respond with numerical codes with a short summary. Follow these steps to the send an email using command line:

1. Open a connection with the mail server using netcat nc -nv 192.168.1.105 25.
2. Initialize an SMTP session with the HELO testmail command.
3. Specify the from address using the MAIL FROM:<[e-mail]> command.
4. Specify the recipient's address using the RCPTS TO:<[e-mail]> command.

 

5. To enter data into the mail body, type DATA, press Enter, and type . (full-stop; this is a terminating character, and you can use any ...