Qmail can't receive special user's mail

[liu zhi]

I installed Qmail-1.03 in Redhat6.2. And I use /var/spool/mail/user mothed to receive mail.(I just copy /var/qmail/boot/proc as /var/qmail/rc) And I use user liuzhi to receive mailer-daemon,root,postmaster mails.(So I add liuzhi to /var/qmail/aliases/ .qmail-root .qmail-mailer-daemon .qmail-postmaster) And now I encounterd a stranger problem. Every user except user liuzhi can receive mail. Who can help me.