[Mailman-Users] how-to make announce-like mail list: several write, all other read only

[Dmitry V. Sukhodoev]

i have successfully installed Mailman 2.1.5 and this works funny. now i need 
make mailing list with news/announces, where will can post only selected 
people and all other only read this list. 

i have found only one possible way to do this - to make all users moderated, 
and process all their messages by moderator, before it posted to lists. 

but i want to selected members can write to list without any confirmations 
and of course need to be secure, cause "From:" address is light to lie. 

what is right way to do this? 

-- 
Dmitry Sukhodoev, servers maintainer of chics.ru, icq#550315