[Mailman-Users] how to prevent postings with faked moderator emailadress

[Tobias Bielohlawek]

Hi

I'm running a personalised on-way list. So only the moderator is 
allowed to post.
For that I've put his mailadr. to the moderator list. Now all posting 
from this adress are accepted
everything else gets rejected.
But as you know, emailadresses can be faked and so it is possible that
somebody else  can post to the list.
Is there any way to make the list more secure?
e.g. the moderator has to put a password into his posting or subject!?

Thanks
  Bye Tobi