2009/6/22 Brion Vibber brion@wikimedia.org:
Based on existing experience, it creates a huge headache for list moderators, and usually the mod queue just accumulates until it's so long it takes a half hour to load it in your browser so the whole thing gets blown away and the list gets set back to auto-discard... thus moderation of non-subscriber mails is unsuccessful.
Some lists are spammier than others. I just cleared the wikimediauk-l queue today, though first I checked the daily status email and there were no human emails in it. OTOH the wikien-l queue was regularly so long as to be painful.
- d.