Milter-greylist

On Mon, Oct 17, 2005 at 10:45:35AM -0400, Matt Kettler wrote:
> Matthias, how does that help against a dictionary attack?

Very well.

> You can't put all possible combinations of username into /etc/mail/access.
> The access list would be infinitely large.

You whitelist valid e-mail addresses and blacklist everything else:
From the automatically generated part of my "/etc/mail/access":

To:tron@...			RELAY
To:postmaster@...			RELAY
[...]
To:colwyn.zhadum.de				error:5.1.1:550 User unknown

	Kind regards

-- 
Matthias Scheler                                  http://scheler.de/~matthias/