Geert Hendrickx a écrit :
> On Thu, Jan 29, 2009 at 12:22:13PM +0100, mouss wrote:
>> Jan 29 00:38:17 imlil postmx/smtpd[26222]: NOQUEUE: reject: RCPT from
>> unknown[147.203.208.166]: 550 5.7.1 Client host rejected: cannot find
>> your hostname, [147.203.208.166];
>> from=<3ff.4.69709687-17084...@cherryimprovise.com> to=<mo...@netoyen.net>
>> proto=ESMTP helo=<redirector-vm01-evip-aol.CherryImprovise.com>
>>
>> => as you can see, reject_unknown_client rejects this even if it has a
>> PTR.
>
>
> In legitimate cases, I've experienced that this response ("cannot find your
> hostname", which is the same response as if there was no PTR at all) can be
> confusing for the administrator on the client side.
In this particular case, this is irrelevant (as I said, I only do the
check because the sender address hits a rule to catch snowshoe spam).
but I guess you are talking about a general case.
> Perhaps something like
> "your reverse hostname doesn't match your IP" would be more informative (so
> they don't have to contact us to ask what it means) ?
>
Whatever the text you set, you'll find people that don't understand it ;-p
you could use a URL to provide "more infos" (including a whitelisting
form), but even then, there is no guarantee that the text will be shown
as is to the user (the MUA or exchange or whatever can rewrite the text).
