I would like to trap and then use the absence of a Host name in ACL
Connection.
condition = ${if and{ {def:sender_host_address} \
{!def:sender_host_name} } {yes}{no} }
The above condition, found on the Internet, can not discriminate between
the absence of a host name and the absence of a Reverse DNS entry.
On Sat, 2014-08-23 at 14:37 +0100, Jeremy Harris wrote:
> >> What are you defining as "absence of a host name" ?
> > A look-up using the sender's IP address produces: 3(NXDOMAIN)
> A lookup of what, in what?
>
> It sounds a bit like a Reverse DNS lookup to me...
> If that's what it is, how are you defining the difference
> between "absence of a host name" and "absence of a Reverse DNS entry"?
I wondered if Exim can define the difference between
(a) the sender's host IP address not having a look-upable name; and
(b) the sender's host IP address' name not having a look-upable IP
address.
The above condition does not distinguish between the two related but
different states.
--
Regards,
Paul.
England, EU.
Centos, Exim, Apache, Libre Office.
Linux is the future. Micro$oft is the past.
