Step 1-
We assume you have Gmail. If you dont have Gmail, you deserve the Spam
You click -show original on the drop down in the spammy message
you see a lot of mumbo jumbo
(or you just pick the IP addresses from comment spam)
Step 2-
You pick the IP addresses from the mumbo jumbo above (called headers )
http://en.wikipedia.org/wiki/IP_address
An Internet Protocol address (IP address) is a numerical label assigned to each device (e.g., computer, printer) participating in a computer networkthat uses the Internet Protocol for communication.[1] An IP address serves two principal functions: host or network interface identification and locationaddressing
Step 3-
You find out who has that IP address using arin
Step 4-
You put those IP addresses in your firewall for your computer
http://technet.microsoft.com/en-us/library/cc733090(v=ws.10).aspx
(or if you have a self-hosted blog using Website cpanel ip deny)
http://www.siteground.com/tutorials/cpanel/ip_deny_manager.htm
Step 5-
Communicate to that IP Address using IRC
http://en.wikipedia.org/wiki/Internet_Relay_Chat
Internet Relay Chat (IRC) is a protocol for real-time Internet text messaging (chat) or synchronous conferencing.[1] It is mainly designed for group communication in discussion forums, called channels,[2] but also allows one-to-one communication via private message[3] as well as chat and data transfer,[4] including file sharing.[5]
or use HOIC to test your own firewall better before people spam you
http://gizmodo.com/5883146/what-is-hoic or
http://www.decisionstats.com/occupy-the-internet/