I’ve recently begun using the ‘hold’ queue, because of a milter that I use. A milter may ‘quarantine’ a message, which causes the message to be placed in the ‘hold’ queue (eg OpenDMARC does this when the DMARC policy requests quarantine).
But how does one manage that queue? I know that postqueue/postsuper/postcat exist, but it seems like a lot of work to periodically (daily, weekly?) inspect each message in that queue and deal with them one by one? Do people actually use quarantine/on-hold, and if so how do you manage your queue?