| To: | qmail ML <qmail@list.cr.yp.to> |
|---|---|
| Subject: | Re: [Christmas Gift for free] 50% Spam reduction ! |
| From: | Roger Walker <roger@rope.net> |
| Date: | Sat, 23 Dec 2006 21:11:05 +0000 (UTC) |
| Delivered-to: | sp-com-lists@consult.net |
| Delivered-to: | gmail-qmail@securepoint.com |
| Delivered-to: | sp.com.list@gmail.com |
| Delivered-to: | mailing list qmail@list.cr.yp.to |
| In-reply-to: | <3.0.6.32.20061222190856.00b84580@192.168.192.1> |
| Mailing-list: | contact qmail-help@list.cr.yp.to; run by ezmlm |
| References: | <3.0.6.32.20061222190856.00b84580@192.168.192.1> |
| Reply-to: | Roger Walker <roger@rope.net> |
On Fri, 22 Dec 2006, Erwin Hoffmann wrote:
> introducing a delay in qmail-smtpd EHLO greeting by about 30 secs will
> reduce the amount of spam emails by typically 50%.
This was tested a while back by a local university and it was
found that the optimum time was a delay of 30 seconds. Unfortunately, it
does not take into account that many high volume LEGITIMATE senders will
drop their connection if there is even a short delay. Workopolis comes to
mind, but there are others.
--
Roger Walker
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