Re: IMPORTANT BUSINESS TRANSACTION FOR YOU PLEASE READ AND REPLY!!!!!!
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Dave Sherohman wrote on 2008-04-07 17:44:
> On Mon, Apr 07, 2008 at 02:43:56PM +0200, Johannes Wiedersich wrote:
>> IIUC, you propose that there is a special way for non-subscribers to
>> post, that locks out spammers at the same time? How should that work?
>>
>> The only thing I could imagine, is one of those silly 'type the letters
>> that you find in this image' stuff.
>
> I believe the technique you're looking for is "greylisting".
I know the concept of greylisting. Are you sure, that we do want
greylinsting on debian? Do we want that poor lads on dial-up have to
dial-up several times in order to send a simple, short text message?
[...]
> No user interaction is required in this process and its only
> user-perceivable cost is a small delay in receipt of the first message
> from any given sender address to the greylisting server.
It depends. In unlucky situations without permanent internet connection,
the cost could be higher.
The more users use greylisting, the more spammers will find ways around
it (like sending all messages twice, after a delay of several minute).
> Greylisting isn't 100% effective, as it doesn't work on spam that comes
> through an open relay (or a mailing list...) and some spam mailers
> actually implement SMTP properly, but it still works very well. When I
> enabled it on my mail server earlier this year, the volume of spam
> received immediately dropped by 70-80%.
It did reduce the amount of spam, when I had it installed, but most of
the spam I get, is filtered automatically by other means or is from
lists, so the cost of delay time was more precious to me and I removed
it again.
YMMV,
Johannes
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