[anti-abuse-wg] What to do if ISP rejects Abuse Reports?

On 14/Jan/12 14:19, U.Mutlu wrote:
> my systems get attacked from several IPs from Georgia (Countrycode=GE, RIR=RIPE).
> My Abuse Reports to the abuse address (ib at caucasus.net) of the
> responsible ISP for the attacker IPs (caucasus.net) just bounce:
> 
> #ID:        <SCC9B>
> #Mail From: <security at mutluit.com>
> #Rcpt To:   <ib at caucasus.net>
> #Server:    <mail.caucasus.net> [62.168.168.131]

Only found it on http://www.backscatterer.org/?ip=62.168.168.131

> #[<02>] The reason of the delivery failure was:
> #
> #550 5.7.1 <security at mutluit.com>: Sender address rejected: Blocked by postmaster
> 
> What to do in this case?

What I do is to ban the offending IP address for some months, using a
firewall filter.  I try to notify that I do so to <postmaster> at that
address if it listens on port 25, or to any *-c of that network.

Is this the recommended procedure?