Apparently-To in sendmail

[B. Rahardjo]

I posted this question before but never got an answer.
I am trying to make a mailing list based on sendmail.
It turns out every mail has a list of the recipients in the header,
i.e.

Apparently-To: mr.a at bcd.ejk
Apparently-To: mr.z at bcd.ejk

How can I hide this ? Can someone give me a good example of mailing
list (and how to protect bounced mails) ?

Budi
-- 
Budi Rahardjo        | rahardj at ccu.UManitoba.CA
Electrical Eng.      | rahardj at ccm.UManitoba.CA
U. of Manitoba       | rahard at ee.UManitoba.CA
Winnipeg, Manitoba, Canada - R3T 2N2