Stop msn messenger spam in Adium

Annoyingly the default setting when you add an msn account to Adium is to “allow anyone to contact you”. And boy they do! Even more annoyingly, the setting to switch this off is not on the Edit account -> privacy tab, but rather on the main menu: Adium-> Privacy Settings. You will need to be connected to your msn account for it to appear as an option in the pulldown menu.