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When the destination of a spool queue is another spool queue the job is simply forwarded without any modifications. However, sometimes it is essential that the job be modified before forwarding, as when the remote spool queue is actually a printer, and jobs need to be converted to the format acceptable by the remote printer or banner pages added.
The lpd_bounce flag marks a spool queue as a bounce queue. Lpd will perform all of the usually job processing steps, such as banner generation, filtering files, etc, but saves the output to a file. This file is then sent to the destination print queue for further processing.
# Simple example of a bounce queue bounce:lp=bounce@bouncehost bounce:server :lp=lp@remote :lpd_bounce :sd=/var/spool/lpd/%P :filter=/usr/local/bin/lpf # uncomment ab if you want banner #:ab