Re: [exim] rDNS lookup problem

On 9 June 2016 at 20:19, Andy Smith <a.smith@???> wrote:

> Hi,
>
> I'm running Exim 4.86.2 on FreeBSD 9.3 and I'm having an issue whereby
> it is registered incoming mails as originating from hosts without an
> rDNS record, but they do have an rDNS record. I've just enabled the
> X-Host-Lookup-Failed ACL to add the extra header and it confirms what I
> was seeing by enterpreting the "Recieved:" header.
>
> For example when sending from 93.191.32.251 I see:
>
> X-Host-Lookup-Failed: Reverse DNS lookup failed for 93.191.32.251
> (failed)
>
> and
>
> Received: from [93.191.32.251] (port=49828 helo=asigra2.ldex.co.uk)
>
> but nslookup from the mail server itself provides:
>
> nslookup 93.191.32.251
> Server: 8.8.8.8
> Address: 8.8.8.8#53
>
> Non-authoritative answer:
> 251.32.191.93.in-addr.arpa name = asigra2.ldex.co.uk.
>
> Any clues as to why Exim is failing when nslookup/dig from the same host
> using the same DNS server work?
>
> thanks in advance, Andy.
>
>

Hey Andy,

X-Host-Lookup-Failed is not a standard Exim configuration option, AFAICT.

But hey, please run your own local DNS server for the lookups and see if
that makes a difference.

Install your own local caching DNS server.



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Odhiambo WASHINGTON,
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"Oh, the cruft."