spamming of ML addresses

[<pl...@pi...>]

Hi,

for the last three weeks I have been getting massive amounts of SPAM 
from the address I use for this ML. I am going to have to shut down the 
account.

This is presumably because sourceforge mailman service archives this as 
a public list exposing contact emails which have been trawled by spammers.

Is there  a way to prevent full addresses being exposed in that way?

Are others having this problem?

Peter.