/usr/lib/qmail/boot/home is in qmail 1.06-4.
This file is owned by root:qmail, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh
# Using splogger to send the log through syslog.
# Using qmail-local to deliver messages to ~/Mailbox by default.
exec env - PATH="/var/lib/qmail/bin:$PATH" \
qmail-start ./Mailbox splogger qmail
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