mail_location = maildir:~/Maildir

namespace {
  prefix = INBOX.
  separator = .
  inbox = yes
}

... is wrong.  Apparently it should be ...

mail_location = maildir:~/INBOX

...which at least seemed to work, although (by that time?) I wound up re-downloading all mail.

Steve Newcomb
srn@coolheads.com

(Unable to edit the wiki page...  Mysterious question stood in the way, something like, "How do you prevent spam?"  Evidently I don't know the correct answer.