> > Namely with 22 RBL results coming back, the last one
> > (which was the crucial URIBL test) had a timeout of 0
> > and was ignored even though dns result did arrive.
> >
> > Moreover, there is a bug in Mail::SpamAssassin:ns, where
> > a late-spawned URIBL queries (which only start after Razor,
> > DCC and Pyzor are run) are being timed against start time
> > of the first wave of plain RBL dns queries, which are fired-off
> > seconds earlier, so there is a good chance that URIBL queries
> > time out in 0 seconds and their resultes are never collected.

I submitted a problem report, with a proposed patch:

Things are much more predictable now.