Re: [exim] Greylistd

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Συντάκτης: Marc Perkel
Ημερομηνία:  
Προς: Josip Rodin
Υ/ο: exim-users
Αντικείμενο: Re: [exim] Greylistd


Josip Rodin wrote:
> On Wed, Nov 29, 2006 at 11:42:10AM -0500, Dean Brooks wrote:
>
>> Keep in mind that there *are* sites out there that:
>>
>>    - Dont ever retry at all
>>    - Retry only once after one hour
>>    - Retry once only every 24 hours
>>    - Treat temporary errors as failures
>>    - etc.

>>
>
> I recently encountered one ISP which retries in fifteen minute intervals,
> but only three times, before it gives up. Wackos.
>
>


And therein lies the rub. I think the solution is to apply greylisting
selectively rather that to everyone. Suppose that you only applied
greylisting to hosts that:

Have bad RDNS
In home/dynamic IP ranges
Fail and header test
Has any slightly weird HELO
Mail From:<>
Listed in Blacklists like Spamcop that are not good enough to block on

What that you will probably block almost as much spam without the delays.