postfix + procmail + BCc: not recieving BCc
 

hello,
there is a problem with my mail server(postfix +procmail+fetchmail
+RedHat 9).The problem is that if a mail is sent from outside(eg: from Hotmail) as Bcc it is not recieved by corresponding user in my mail server . If the address is specified in To or Cc ,it works fine.What might have gone wrong?
My .procmailrc looks like,

:0 c
* ^TO_user1@mydomain.net
! user1@hostname


requesting everyones co-operation,
jus