Quoting Michael Paoli (Michael.Paoli@cal.berkeley.edu):
Might we want to tweak the configuration so the "nag" e-mails only go out at most once per day?
Unfortunately, I know of none. There's an option of enabling or suppressing immediate notice of pending _subscribe_ requests (for mailing lists requiring listadmin approval on join requests), such that those are sent only in the daily reminder batch. Or you might be thinking of the digest mode option for _list_ mail sent to subscribers -- as distinct from moderation-needed (nagmail) notices to listadmins/moderators.
We could set "Discard held messages older than this number of days. Use 0 for no automatic discarding." to something other than the zero default -- say, to one day. That would lose most spam, at the risk of occasionally discarding something legitimate.
The above is a poor remedy, attempting to partially compensate for Dreamhost being basically pretty incompetent at its task of spam-rejection at the MTA level. Just to clarify: That is not a complaint, but I think it's helpful to recognise the fact, if only to clarify what exactly Michael's talking about: Most people reading balug-admin will be unaware of this, but the listadmins are called upon to "moderate" some 15-20 held non-subscriber postings per day, aimed at each of our mailing lists, essentially all of those being spam (mostly Japanese).
I personally do a _much_ better job of spam-rejection at my own MTA, and nobody's paying me for that. Dreamhost is screwing up the same task by the numbers, and this is an important (if difficult) part of their _job_.
BALUG is currently, via its moderation messages and spam sent directly to Mailman *-owner and *-bounces mailboxes, the second biggest source of spam in my life, vying for first place with Bay Area FreeBSD User Group's Mailman addresses (a group for which I also do listadmin duty).