On Thu, Nov 27, 2003 at 01:13:52PM +1030, [EMAIL PROTECTED] wrote:
> We have a number of hosts spamming us using the mailing to a wrong address
> which doesn't exist but crafting the reply to address as someone else so
> they receive a bounce message and open it and it's spam.  
> 
> I've tried blocking about 10-15 hosts with iptables and that shuts them up
> for a while but doesn't take long for more to appear.   the poor old 64k
> connection is being flooded with this rubbish and i wonder if there is a
> good way to stop it.  the mailservice doing the spam check is acting as a
> gateway for an exchange server so it's not a matter of making sendmail do
> something fancy and not accepting mail for addresses that don't exist,
> although that means that real mail boucing may end up in the dump should we
> go that way.

I've asked about "reversing" FEATURE(`blacklist_recipients') in
comp.mail.sendmail, but haven't had an answer.  I'm in the same boat,
but also have considerably more than 64kb/s to work with... :-)

> anybody got any thoughts on a live blocking setup or seen a decent list of
> spammers hosts that is fairly up to date?

http://www.spamhaus.org/

-- 
John Oliver, CCNA                            http://www.john-oliver.net/
Linux/UNIX/network consulting         http://www.john-oliver.net/resume/
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