Re: Greylisting (Was Re: [Hampshire] Spam increase?)

Hi,

On Wed, April 25, 2007 5:56 pm, Andy Smith wrote:
> On Wed, Apr 25, 2007 at 05:40:19PM +0100, Tom Dawes-Gamble wrote:
>>
>> On Wed, April 25, 2007 3:06 pm, Andy Smith wrote:
>> > Just bear in mind it is not a panacea and has some quite serious
>> > downsides.
>>
>> What are these serious downsides?
>
> First and foremost you have to tweak what you consider to be "the
> same source" when looking for attempts from "the same source" --
> large networks like gmail, yahoo!?!?!,

Yes I use postgrey and it has rules to handle number of domains like that.

> Basically you are intentionally slowing down email by rejecting it
> temporarily. In an ideal world where everyone complies with common
> internet practice this would introduce a ~10 minute delay, once.
> However the real world is full of companies like NTL and Yahoo!?!?!
>

Yes it's not ideal. But then this is not an ideal world.

> so the drones will start to cope with tempfails; it's not hard. So
> the whole idea has a very limited lifespan which reduces faster the
> more people use it.
>

Of course. But that is not really a down side.

I would say that well over 90% of the mail coming in to my mail server is
spam. Since I started Grey listing my spam has become managable by hand.

Yesteday I greylisted 199 emails 179 didn't retry. So I guess that was
spam.

In the two months or so I've been using it no one has had problem mailing
me and none of the other users have complained of mail not getting though.
In fact they have commented how wonderful the new system is.

Yes once the drones start to retry greylisting becomes useless but till
they do I'll keep using it. :-)


> There is still no FUSSP:

No there isn't but that doesn't mean you shouldn't use what tools are at
your disposal.

grey listing may not be the answer but for some it does a good job.
No one solution will suit everyone. Lets face it if it did everyone would
use linux.

Tom.
--
There are 10 sorts of people in the world.
Those that understand binary and those that don't.