Re: How to filter these spam messages

[Simon]

Why can't we simply have a new ruleset to score these short spam messages
higher?

-Simon


On Mon, 16 Oct 2006 20:44:58 -0600, Gary V wrote:

>
>>On Oct 16, 2006, at 2:27 PM, Simon wrote:
>>
>>>
>>>I reviewed greylisting as a solution in the past, we couldn't accept it
>>>due to
>>>delay and I also read not all email servers will resend properly. So
>>>there is a
>>>chance few legitimate emails will never get redelivered. When you are
>>>running
>>>a business shop, such delays or exceptions are not permitted.
>>
>>Fortune 500's are greylisting... so why is it not acceptable? Really,
>>you should try it for a bit and see if it really works.
>>
>>sqlgrey keeps a list of sites/addresses that have proven themselves good,
>>and so over time it delays less legit email. It also has a list of known
>>sites that are broken to whitelist.
>>
>>When I implemented greylisting for one site, they called in the next
>>morning sure that email was broken. But after poring through the logs, we
>>determined that the real issue was simply that they didn't get any legit
>>email all night, and all the usual spam had been turned away. Once
>>business hours opened up, their clients started emailing them, and the
>>legit messages came right in.
>>
>>It also reduces the load on the SA servers, which makes the delivery time
>>quicker. In my experience, greylisting averages out better. :)
>>
>>
>>David Morton
>>Maia Mailguard http://www.maiamailguard.com
>>[EMAIL PROTECTED]
>
>I don't use greylisting on my primary MX because I do not wish to delay
>mail, but I do on my secondary (not round robin) - and it is very effective
>there.
>
>I have one of those SMTP servers (from a major company) that does not retry.
>Because of greylisting, I can no longer safely use it for outbound mail -
>and don't.
>
>Granted, these links are specific to Postfix, but offer some insight into
>lessening the possibility of loosing legitimate mail to greylisting:
>http://lists.ee.ethz.ch/postgrey/msg01214.html
>http://www.stahl.bau.tu-bs.de/~hildeb/postfix/postfix_greylisting.shtml
>
>Gary V
>
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