> > BTW, the RBLs are good not only for rejection, but eg. to
> > disable PIPELINING for suspicious hosts too...
>
> I've never used external blacklists (because I don't trust other
> people to make my spam decisions for me), but that would be a harmless
> use for them.
Another not too harmful use of some black and white RBLs
is for decision to greylist (for 3 min) or not.
For decision to disable pipelining on incoming connections I use
(I'm not sure whether it works):
pipelining_advertise_hosts = ${if eq{$sender_host_name}{$sender_helo_name}\
{*}{+whitelisted_hosts}}
If you haven't a static local white list then {*}{}}
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