freebsdrocks.net was started originally as nospam.mine.nu.
The easiest way is via command line. The following is one line:
/var/qmail/bin/qmail-inject example@domain.com < /var/spool/qmailscan/quarantine/new/mail1101806345562014465
Change the example@domain.com to the right email account and change the quarantine-message to the right filename.
Spacial thanks to Andreas H