Multi (split) image spam

[Jeff A. Earickson]

On Sun, 6 May 2007, Andrew MacLachlan wrote:
> Subject: Re: Multi (split) image spam
> 
> Not useless - just less effective - and no-one said it was the perfect solution - but it does effectively cut the number of spams a bot can send in half, which is always a good thing.
> Most spam is stopped dead in its tracks by greylisting and is a very effective (also efficient) method of cutting down on the amount of spam that MS has to process.
>
>> and all it does it build up your own outgoing queues
> Not sure how the logic on that one works...
>
>> you might as well firewall off your primary MX
>> making mail fail and force resend via secondary MX's.
> A bit extreme - and anyway spammers have been sending directly to secondaries for years as a lot of organisations don't have spam defences on them so the messages just sail on thru...

I run smtptrapd (see http://smtptrapd.inodes.org/) on another box which is
a secondary MX.  It keeps the spammers busy and helps keep them away from
my primary MX.  If my primary is down, so what?  The legit stuff will
retry later.

Jeff Earickson
Colby College