Author: Marc Perkel Date: To: Mike Cardwell CC: Exim Mailing List Subject: Re: [exim] How would you do this?
Mike Cardwell wrote: > Marc Perkel wrote:
>
>
>>>> Looking up NZ records as follows:
>>>>
>>>> set acl_c_ns = ${lookup dnsdb{ns=$acl_c_sender_host_domain}{$value}fail}
>>>>
>>>> But what I want to do is look up each nameserver to see if any match a
>>>> black list. How would I do that?
>>>>
>>>>
>>> Define the blacklist. Is it a list of domain names or ip addresses for
>>> example? I'm assuming the list will be made up of domains like the
>>> following, but you weren't completely clear:
>>>
>>> ns1.example.com
>>> ns1.badnameserver.org
>>>
>>> Define the lookup. Is it a dnsbl style lookup or something else?
>>>
>
>
>> Yes - I want to look up each name in a name based dnsbl. What I'm hoping
>> to do is lookup/create a name based blacklist based on the nameserver
>> information.
>>
>
> The following would look up each nameserver for the domain
> $acl_c_sender_host_domain and then check them in turn against the
> ficticious rbl rhsbl.example.com until one succeeds.
>
> dnslists=rhsbl.example.com/<|${lookup
> dnsdb{>|ns=$acl_c_sender_host_domain}{$value}fail}
>
> The following would do the same, but could be used in a condition or a
> router:
>
> ${lookup dnsdb{>:a=<:${sg{${lookup
> dnsdb{>:ns=$acl_c_sender_host_domain}{$value:}fail}}{:}{.rhsbl.example.com:}}}}
>
> The second option is less readable, less efficient as it continues to do
> lookups even after one has matched, but it can be used in more places.
>
> *untested*
>
> Mike
>
>
