In my quest for setting up the newsletter module I'm coming across something.
I use the subscription page tha goes with it and this is what happens :
If you subscibe for the first time => No problem
But if you subscibe with same adress a second time it does not erase or replace your first subscrition there seems to an error (basycally the function that should test the presence of another member is not working)
I'm not good enough to dig this but if someone has a patch or came across this before ...