[Mailman-Users] Announce only mailing list

[Adam Gabriel]

I want to create a list that's only used for announcements, and only one or two member can post to it. I have made users moderated by default, and set the moderation to reject posts from mod'ed users. I also set it to discard all non-member posts. It seems to work how I want it to, but I just wanted to make sure of a few things...
Is this the best way to do it?
Is there something else I need to do to make this work the best way (best practices)?
Can someone spoofs a user's email addresses that IS allowed to send to the list (the non-mod'ed users)? Is there a way to stop that (besides changing moderation to all posts being held)?
Thanks in Advance!
-Adam