help

  my system is solaris7,i once used qmail as my MTA and 
  "ln -s /export/home/user/Mailbox /var/mail/user",it work fine
   
  but now, i want to switch from qmail to sendmail8.9.3,and use procmail as LDA
  my question is:
  1,how should i configure my "mc" file to use procmail as LDA?
  2,how should i configure procmail's "authenticat.c " file to
    let procmail deliver mail to /export/home/user/Mailbox?
  please give me more details,because i was totally lost