From: (no name) (no email)
Date: Thu Jun 02 2005 - 03:35:54 EDT
Zitat von Robert Felber <>:
> On Thu, Jun 02, 2005 at 08:45:55AM +0200, Adrian von Bidder wrote:
>> On Wednesday 01 June 2005 12.27, Simon Waters wrote:
>>
>> > So far there is no evidence that the greylisting is becoming less
>> > effective with time, which was one of my concerns (minor concern - the
>> > obvious solution involves using "rm" regularly).
>>
>> My concern with greylisting was that the spammers would catch up and start
>> implementing queueing in their zombies.
>
> queuing is not needed and would be too much programming overhead for
> a spammer. The only thing a spammer would have to do is:
> resend spam to his previous target list again after lets say 5-10 minutes.
Not really accurate. The spammer must resend from the *same* source to the
*same* recipient after the *individual* greylist period of the target host has
passed, so this would be too much effort if you can spam some ohter thousand
addresses in the same time.
> What me more worries is, that services like yahoo hotmail and msn seem to
> have some mystic deals with blacklists - but still allow sending of spam.
The percentage of spam compared to the number of mails is actually really low
from this sites. It isn't that easy to keep a userbase of some million clean.
Regards
Andreas
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