I'm not sure why you need to alias that name but what I would do it just use virtual hosts. I run a Qmail-1.03 server with about 30 diff domains. Set your /var/qmail/control/virtualdomains file to look like this.
I wrote this scripts, very cheasy but it works for me. The server is Solaris 9 so it differs a bit.
echo "Please enter the new qmail username.";
useradd -m $NAME;
echo "$NAME has been added as a UNIX user.";
echo "Adding qmail Maildir to $NAME.";
cp /qmail/.qmail-default /export/home/$NAME
echo "Copied .qmail-default to $NAME's home directory.";
echo "Changing ownership of $NAME's files to $NAME.";
chown $NAME /export/home/$NAME
chown $NAME /export/home/$NAME/*
chown $NAME /export/home/$NAME/Maildir/*
chown $NAME /export/home/$NAME/.qmail-default
echo "$NAME has been added to the qmail database.";