Hiding the senders address

[Brian McGowan <brian . mcgowan @ wnonline . net>]

I'm trying to hide the From: address in the email that goes out to the
list, I only want certain addy's to post to it and think it would be
more secure if their emails were unknown to the rest of the list.  I've
tried changing the $mailer and various other things, but cannot get it
to hide the senders address.

any help would be greatly appreciated, please cc my email if you reply
as I am not on this list.

thanks!
Brian-