Re: Greylisting (was Re: "Fairly-Secure" Anti-SPAM Gateway Using OpenBSD, Postfix, Amavisd-new, SpamAssassin, Razor and DCC ? Can I get your opinion?)

[Andrzej A. Filip]

On 11/29/2012 09:31 PM, Dave Warren wrote:
> On 11/29/2012 12:27, Andrzej A. Filip wrote:
>> On 11/29/2012 08:46 PM, David F. Skoll wrote:
>>> [...]
>>> Also, once a given IP passes greylisting, we remember that and we don't
>>> greylist that server for 40 days.  If you have a large-enough user
>>> population,
>>> this can greatly mitigate the problems caused by initial greylisting
>>> delays.
>> Do you treat "yahoo like" spam sources in the same way?
>
> There's almost no point in greylisting an IP that you know will retry
> properly anyway, so why wouldn't you allow that IP to bypass
> greylisting in the future?
>
I assume that greylisting of "yahoo like" spam sources increases chances
of "bulk detectors" detecting spam. Is not it trues? [based on real data]