Thank you. I will go with central RBL service  and a policy service script.

Sent from phone

-----Original Message-----
From: "Wietse Venema" <[email protected]>
Sent: ‎9/‎11/‎2015 2:15 AM
To: "[email protected]" <[email protected]>
Subject: Re: Check NS (name or IP) against RBL

Viktor Dukhovni:
> On Fri, Sep 11, 2015 at 12:25:56AM +0300, Marius Gologan wrote:
> 
> > Is there any way to check the name server (name and/or IP) of the Sender
> > domain against RBL service?
> 
> Only via a policy service that does the relevant DNS lookups.

I have used check_sender_ns_access to block persistent spammers.
There are also check_sender_mx_access, and similar features for
client, helo, recipient.

        Wietse

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