I use Pidgin as my instant messenger application. Mainly because it allows me to chat to clients and sub-contractors across Yahoo, Google, MSN etc all in one application, with the added bonus of not being full of spam and adverts to hurt my eyes.
For a few weeks I started to get loads of MSN spam, I was nearly forced to use the Windows Messenger client!
But there is an option in Pidgin that puts an end to this plague.
Click Tools, then Privacy.
Select your MSN account(s) and choose “Allow only the users on my buddy list”.