Author: Dave C. Date: To: F.F. Jacot-Guillarmod CC: exim-users Subject: Re: [Exim] Large numbers of "failed to find host name from IP
address"?
I can't tell for sure from the log entries you included wether the
rejections are *because* the sender host doesnt have a reverse lookup,
or if they are being rejected for some other reason (and exim is just
making a note of the lack of reverse DNS)..
If the former, you really don't want to do that for the Internet at
large. Yes, there are tons of organizations that can't, won't, or just
don't setup proper reverse DNS. Personally, I trust recording/logging
the IP address rather than whatever host name DNS might give for it
anyway - much more reliable to track down later.
On Mon, 31 Jul 2000, F.F. Jacot-Guillarmod wrote:
> Hi there,
>
> Is it just me, or are there an extraordinarily large number of
> misconfigured reverse DNS zones out there? Recently I'm getting
> lots and lots of stuff that looks like it should be OK:
>
> ------------------------------------------------------------------------------
> 2000-07-31 19:51:07 recipients from [209.207.238.137] refused (failed to find ho
> st name from IP address)
> ------------------------------------------------------------------------------
> 2000-07-31 19:51:09 recipient <XXX@???> refused from (search.aka.com)
> [209.207.238.137] sender=<XXXX@???> (failed to find host name from I
> P address)
> ------------------------------------------------------------------------------
>
> .. but which fail the "exim -bh" test with flying colours.
>
> Do I hang in there and explain to people that there are plenty of
> dingbats out there who don't know what they're doing, or admit that
> I'm one myself?
>
> Puzzledly,
> Jacot
>
