CIMS mail servers are now configured to use procmail as the local delivery agent (the program that is used for delivering messages to local mailboxes).   This means you can no longer use a ~/.forward file to control whether or not procmail is used for delivering messages to your mailbox.  Procmail is now always used for local mail delivery.  You can still use a .forward file to forward mail.  If you do not want to procmail to perform any mail processing whatsoever you should rename your ~/.procmailrc file to something else.  For example:
  mv ~/.procmailrc ~/.procmailrc.OFF