How to hide rcpts. in majordomo?

[a_vogt @ gaia . de (Andreas Vogt)]

Hi all,

As far as I see, our mailinglists don't hide the users in outgoing  
mailings.

Some recipients told us, they can see all members of the list in the  
header information.

We use sendmail as MTA, so I thought, majordomo would send mails to  
mailinglists one by one.

Can I tell majordomo to use Bcc: header (blind carbon copy), as I don't  
want to know the recipients who else is on our lists ?

Thanx

bye
Anders