Re: minimizing bandwidth taken be spam delivery attempts even when identifiable by "To:" address
On Wed, 2006-02-15 at 16:08 -0500, Daniel B. wrote:
> Clive Menzies wrote:
> > On (15/02/06 12:58), Daniel B. wrote:
> >>What anti-spam method minimizes the network bandwith used by spam
> >>delivery attempts?
> > sa-exim with spamassassin rejects mail at SMTP time which may solve your
> > problem
> I was _already_ talking about rejecting mail at SMTP time.
There's a rule in my mail server's firewall's input chain that looks for
new incoming connections to port 25 and sends them to the "spammer" and
"asia" chains where the connections are rejected on IP.
bogofilter identifies spam and directs it to the spam box. Then a Perl
script goes through that mail every couple hours and puts the IPs in the
spammer chain for a couple weeks. The script also scans the currently
active mail log for rejects due to the Spamhaus RBL.
Another script downloads the assigned IPs in China, Korea, and Taiwan
once a month and puts all of them in the asia chain.
If there's a less bandwidth way than at the firewall, I'd like to know
about it. Maybe hiring a spammer-assassin...