can't receive the mail I've sent to myself

[Essy Ren]

I've install qmail, daemontools, ucspi-ipc-0.55, ucspi-tcp-0.88 and checkpassword-0.90. I can send message to [EMAIL PROTECTED] but I can't receive that mail, where's the mail go to ? I've set up all the instruction at INSTALL, FAQ, INSTALL.vsm, INSTALL.maildir and also take a look at LWQ. But I don't know where's the "wrong step" I've made so I can't receive the mail I've send ...