[Mailman-Users] Creating a Broadcast list

[LuKreme]

I need to create a list ion which no-one can post but the list admin.  
So I created the list, set it to all users are moderated, moderated 
posts are rejected, etc.

But what is preventing someone from spoofing the list admin's return 
address and posting to the list?

-- 
...when you're no longer searching for beauty or love, just some kind 
of life with the edges taken off.  When you can't even define what it 
is that you're frightened of; this song will be here.