Milter-greylist

On Tue, Apr 09, 2013 at 09:01:50AM +0200, Peter Bonivart wrote:
> Couldn't you make the exact same argument about greylisting? 

I do not think so.

Working around greylisting means maintaining a queue. Since spammers
use botnet, resources are free for them but they are not infinite. 
If the greylisting delay is long enough, we observe they do not afford it.

Beside this, greylisting does not scale for really huge domains, which 
means that the incensive for working it around remains low: gmail, hyahoo,
hotmail and other monsters will never use it.

-- 
Emmanuel Dreyfus
manu@...