>
> I=E2=80=99ve been sort of opposed to greylisting in the past due to a use=
rbase that=E2=80=99s sensitive to delays, but=E2=80=A6 the spam is worse.
>


IMHO Greylisting is rather pointless. Its a blunt tool, and not only that i=
t does that unforgivable thing of annoying genuine people.

I would hazard a guess that if you are being innundated with spam, then you=
r RBL setup is less than adequate. Both the choice of RBLs  ***AND*** the c=
orrect configuration thereof is critical.

I should also add that you should not be afraid to pay for access. The good=
 lists will (a) block you if you hammer them with high volumes of requests =
(b) save some of their better content (or new innovations) for their paid s=
ubscribers.

RBLs these days are pretty darn good, with everything setup correctly you c=
an easily be in the very high 90-percentiles of catching spam and pretty mu=
ch zero false-positives.