qmail deb question

["david hong" <davidhong1999@host.sk>]

i downloaded the installed all these from smarden.org/pape/Debian/..
daemontools_0.76-woody1_i386.deb
daemontools-run_0.76.3_all.deb
ucspi-tcp_0.88-woody1_i386.deb
dot-forward_0.71-woody1_i386.deb
fastforward_0.51-woody1_i386.deb
qmail-run_1.0.0_all.deb 
qmail-uids-gids_1.0.0_all.deb
qmail_1.03-woody1_i386.deb 

All services running fine.
when i test to send a local mail, i can see the mail sent out
successfuly at the mail.log file.
However, i can find the mail at /var/spool/mail.

anyone knows where the mail store?