duplicate database pruning

[Andrew Morgan]

Does the sieve vacation module use the duplicate delivery database to
track which email addresses it has already responded to?

By default I create vacation messages for my users through a web interface
and it sets the vacation history to 7 days.  However, I am currently
pruning my duplicate delivery database every day (-E 1).

Should I only prune entries older than 7 days?  This is a fairly active
email system (35000 accounts), so I don't want to let the duplicate
delivery database get too large.

Thanks,
Andy Morgan
Central Computing
Oregon State University