> Guy wrote:
> > Hi guys,
> > I had a problem earlier today when our local DNS server's forwarding
> > servers were slow to respond.
> > I had a number of emails from various sources rejected as blocked by
> > zen.spamhaus.org. The IPs I checked weren't on the list according to
> > the spamhaus website.
> No, this is false. Postfix will log a warning and pass the
> mail when an RBL query times out.
He was using "reject_RHSBL_client zen.spamhaus.org". I speculate
that his ISP was making some money by redirecting non-existent name
lookups. Usually such ISPs are smart enough not to do this with