Go Back   HowtoForge Forums | HowtoForge - Linux Howtos and Tutorials > ISPConfig 2 > Feature Requests

Do you like HowtoForge? Please consider supporting us by becoming a subscriber.
Thread Tools Display Modes
Old 31st May 2007, 10:28
goldstift goldstift is offline
Junior Member
Join Date: Feb 2007
Location: Hilden, Germany
Posts: 16
Thanks: 3
Thanked 3 Times in 3 Posts
Default Detect SPAM before actually receiving it


I just read about a very handy strategy handling spam mails. I think the problem with most of us is that scanning mails for spam takes up a lot of system ressources and may even cause a system to hang.
The suggestion now is to check the ip of the sending mail server via an "ehlo" before actually receiving the mails. They also suggest to insert an "artificial wait time of about 2 seconds" to annoy profi spammers as they will loose time which is money for them.

I have found two ressources explaining it a little more detailed:
http://gerstmann.net/index.php?optio...id=68&Itemid=2 (german)

Perhaps you could somehow build it into ISPConfig.

Reply With Quote
Sponsored Links
Old 31st May 2007, 11:27
till till is online now
Super Moderator
Join Date: Apr 2005
Location: Lüneburg, Germany
Posts: 37,012
Thanks: 840
Thanked 5,651 Times in 4,461 Posts

You can use policyd with ISPConfig. Just install it and configure your postfix main.cf to use it.
Till Brehm
Get ISPConfig support and the ISPConfig 3 manual from ispconfig.org.
Reply With Quote
Old 31st May 2007, 20:04
AlArenal AlArenal is offline
Senior Member
Join Date: Feb 2007
Location: Germany
Posts: 104
Thanks: 1
Thanked 5 Times in 5 Posts

Seems as if there are some others occasionlly reading comments to Heise's news

I read Gerstmann's article, had to agree and nodd to a lot of what he says (about rejected mail being not that bad at all) and tweaked my config. To me, receiving 50-80 spams a day is normal.. or at least it has been. Today the count went down to - believe it or not - three!

Customers were also positive about receivig a lot less marked spam and my server also gets some breathing room....

Next step will be checking out policyd...

Last edited by AlArenal; 31st May 2007 at 20:07.
Reply With Quote
Old 31st May 2007, 21:51
sjau sjau is offline
Local Meanie
Join Date: Apr 2006
Location: Switzerland
Posts: 1,158
Thanks: 4
Thanked 58 Times in 54 Posts

Have a look here, this is some native blocking stuff:


Btw, Heise does not offer RSS right?
Reply With Quote
Old 31st May 2007, 22:09
AlArenal AlArenal is offline
Senior Member
Join Date: Feb 2007
Location: Germany
Posts: 104
Thanks: 1
Thanked 5 Times in 5 Posts

All of Heise: http://www.heise.de/newsticker/heise.rdf
Only Heise Security: http://www.heise.de/security/news/news.rdf
Reply With Quote
The Following User Says Thank You to AlArenal For This Useful Post:
sjau (1st June 2007)
Old 3rd November 2007, 01:57
RalphG2SL RalphG2SL is offline
Junior Member
Join Date: Aug 2007
Location: South America
Posts: 3
Thanks: 0
Thanked 1 Time in 1 Post

It's available in english too:
Multilang URL: http://Gerstmann.Net/How2BlockSpam.html
English URL: http://gerstmann.net/content/view/68/2/lang,en/
German URL: http://gerstmann.net/content/view/68/2/lang,de/

Originally Posted by goldstift
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Receiving a lot of spam garfabian Installation/Configuration 11 9th December 2007 14:59
In ISPconfig whitelist but still seen as spam edge Installation/Configuration 12 5th September 2007 01:30
How to kill spam when spamassassin marks it spam kpimichael Suggest HOWTO 15 6th August 2007 17:44
Forwarded spam mail not discared by antispam filter NETabuse General 7 26th February 2007 21:02
root mail receiving spam Jaxboy General 1 19th October 2006 11:51

All times are GMT +2. The time now is 18:44.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.