Re: [exim] IPs which spam for many, many, domains

On Tue, 16 Aug 2005, Tony Finch wrote:

> In order to do this without source changes, I think you'd have to
> use the dnsdb lookup.

You mean starting from the email domain, looking up MX record(s) and
getting one or more A record(s), then looking up those A records to
get one or more IP(s) - finally looking up IP(s) in a local blacklist
(or in DNSRBLs - having reversed the ordering of the octets!). And at
each stage, possibly getting silly or anomalous answers out of the
DNS...

> I suspect it would be fiddly.

Quite so! and it's something which exim has to do internally anyway -
at least as far as looking up the A records to get IPs - which is why
it seemed so genial to tag along with that ignore_target-Hosts
mechanism.

thanks.