Re: [exim] Ratelimit Tricks - Using ratelimitwithoutlimiting…

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Autor: Marc Perkel
Datum:  
To: Graeme Fowler
CC: exim-users
Betreff: Re: [exim] Ratelimit Tricks - Using ratelimitwithoutlimitingthe rate


Graeme Fowler wrote:
> On Mon, 2007-06-18 at 11:34 -0400, Dean Brooks wrote:
>
>> The only caveat is that there is not currently a way to read the value
>> of a ratelimit counter without causing the counter to advance at
>> least once in the ACLs.
>>
>> This was discussed last November here:
>>
>> http://www.exim.org/mail-archives/exim-users/Week-of-Mon-20061106/msg00323.html
>>
>
> Indeed it was - thanks for the reminder. Interested parties might care
> to look at Bugzilla #428 here:
>
> http://www.exim.org/bugzilla/show_bug.cgi?id=428
>
> A patch to allow the ratelimit counter to be read without incrementing
> it (/ noupdate) has been committed to CVS by Philip this afternoon, so
> it'll be in the nightly snapshot as of tomorrow.
>
> Those who requested this feature back in November would do well to test
> it, either by downloading tomorrow's snapshot or applying the patch
> referenced in bug 428 against Exim 4.67. Usage instructions are in the
> bug report.
>
> Graeme
>
>


Thanks Graeme for adding this feature. I think that it will be useful as
a short term greylist feature such as reducing the effect of dictionary
attacks. After a number of bad recipients the server could defer for 5
minutes mail coming from the attacking IP.