Re: [exim] DynaStop - I like it!

W B Hacker wrote:
> Marc Perkel wrote:
>
>> I have 3 MX records. The highest MX always returns a defer for those who
>> are trying to go in the back door. I'm now using DynaStop to return a
>> defer on the lowest MX record for dynamic IPs. So the middle MX will
>> accept these.
>>
>> What this does is it gets rid of spammers who don't retry. And the
>> decrease has been huge. It has eliminated a lot of spam and has cut the
>> load levels down on my servers significantly. Not getting any
>> complaints. So I have to endorse it using it the way I'm using it.
>>
>>
>>
>
> You haven't actually provided evidence of *why* you believe it is working, and I
> suspect, if only from how quickly you claimed success, that you haven't done the
> analyis required to be able to determine the effectiveness.
> You simply haven't had time to do so. Solid analysis needs days if not weeks of
> traffic.
>
>
The reason why it works is that most spammers don't retry. If a spammer
encounters resistence then they go on to spam someone else. Its far
easier for a spammer to find an unprotected host than to hammer away
against protected hosts like mine.