FYI, closer inspection of the most recent samples (via NANOG) suggests that someone may have stuffed a cork in it circa 0130 UTC yesterday (Sunday), as I don't yet see any messages whose arrival time at mail.nanog.org is later than that. I speculate that perhaps what we're observing now is the outbound MTA queue draining. (Although if that's correct, I don't understand why someone didn't stop it and manually clean it out.) As an aside, a couple of years ago I argued that Mailman should have a feature added that measured the normal rate of message flow (per hour, per day, perhaps per week) and provided a setting which would engage the moderation flag if that rate was exceeded by a (configurable) multiplier. E.g., "if normal for this list is 20 messages a day and and the multiplier is set to 3, then once the message count hits 60 in a 24-hour period, hold all subsequent messages for manual approval". This is one of the use cases that I had in mind for it. ---rsk