(postfix) SPAM filter?

[Jorn Argelo]

Eric Crist wrote:
> On Dec 17, 2007, at 2:36 AM, Jorn Argelo wrote:
>
>>
>>
>> On Mon, 17 Dec 2007 00:20:50 +0530, Girish Venkatachalam 
>> <girishvenkatachalam at gmail.com> wrote:
>>> On 14:48:35 Dec 15, Jorn Argelo wrote:
>>>> Greylisting only works so-so nowadays. There was a couple of months it
>>> was
>>>> very effective, but that is long gone. Spammers aren't stupid, and 
>>>> they
>>>> follow the development of anti-spam techniques as much as e-mail 
>>>> admins
>>> do.
>>>> Greylisting is a start, but from my experience it is not nearly 
>>>> enough.
>>>>
>>>
>>> I have heard this said elsewhere too.
>>
>> Yes don't rely solely on greylisting unless you're a lucky guy and 
>> don't get a lot of spam.
>
>
> I hear a lot of people saying that greylisting doesn't work, when I 
> have actual numbers for my network proving it does.  These numbers are 
> from the first week of May 2007 to today:
[snip]

I'm not saying it doesn't work. As a matter of fact, we're making 
effective use of greylisting as well. With spamd you can see the sender 
address and the HELO for example, so you can make nice scripts of 
trapping forged e-mail addresses, incorrect HELO commands, empty sender 
addresses, stuff like that. Just the greylisting process itself is only 
working so-so in our environment.

All I'm saying is that greylisting is a start and not a solution :) But 
like I said, YMMV.

Jorn