2009/7/2 Ian P. Christian <pookey@???>:
> 2009/7/2 Ian P. Christian <pookey@???>:
>> Hi all,
>>
>> I though I'd seen people post on the list about blocking outright on
>> reverse_host_lookup - however having implemented this yesterday, it
>> seems like it quite possibly did block the occasional email. Before
>> yesterday, it was just used as part of a scoring system.
>
> Whislt on the topic... how can I check that a host has a reverse
> record, without doing the full forward checking that
> reverse_host_lookup does? I can at least block outright hosts that
> don't have a reverse...
>
Quoting from:
http://www.gossamer-threads.com/lists/exim/users/83353
If you want to only check whether reverse DNS exists at all, with no
regard to the subsequent forward-DNS check, you can use something along
the lines of this:
defer
!condition = ${lookup dnsdb{defer_never,ptr=$sender_host_address}{yes}}
log_message = REVERSE DNS: no PTR found for $sender_host_address
message = Sender's ISP has no reverse DNS for $sender_host_address.
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