flexfax: How to *not* delete successful sends?

[Evan Leibovitch <evan@telly.org>]

I'm looking for the appropriate configuration flags and have come up blank
so far. 

Is there a way to configure HylaFax so that jobs that have been
successfully sent do *not* get deleted from sendq? A user would like to be
able to hang onto the exact form of all outgoing faxes (ie, the tiff
file).

Any suggestions? Thanks.

- Evan