Once again I have to suggest you all to use some of the modern > 1Gb mail system (as gmail) to subscribe to the ML. You can set up a new address just for the PDML, and then let it receive it all... When you have time/will to read and maybe contribute with something you just log in and take a look... otherwise, you just collect it.
Storage is cheap this days (actually it's free), why bother unsubsribe/subscribe while you may just ignore it as long as you want? I have a lot of spare invitation if you like bye, Danilo