Gupi

Distributed Checksum Clearinghouses (DCC) este un filtru antispam foarte eficient, bazat pe sume de control calculate pentru mesajele recunoscute drept spam. Sumele de control sunt publice şi implementarea sistemului este foarte simplă.

…
The idea of the DCC is that if mail recipients could compare the mail they receive, they could recognize unsolicited bulk mail. A DCC server totals reports of checksums of messages from clients and answers queries about the total counts for checksums of mail messages. A DCC client reports the checksums for a mail message to a server and is told the total number of recipients of mail with each checksum. If one of the totals is higher than a threshold set by the client and according to local whitelists the message is unsolicited, the DCC client can log, discard, or reject the message

DCC este foarte util ca şi ca filtru adiţional la Spamassassin.

Pentru a instala DCC, paşii sunt în mare aceştia (server Linux, Spamassassin instalat):

1. Asiguraţi-vă că portul UDP 6277 este deschis spre ieşire (outbond UDP 6277);
   eu folosesc un firewall excelent, denumit csf, pentru care setarea se face în fişierul /etc/csf/csf.conf

   nano -w /etc/csf/csf.conf

   verificaţi setarea UDP_OUT:

   # Allow outgoing UDP ports
# To allow outgoing traceroute add 33434:33523 to this list
UDP_OUT = "20,21,53,113,123,873,953,6277"

   şi restartaţi firewall-ul:

   csf -r

2. descărcaţi si instalati DCC:
   

   
cd ~
rm -f dcc.tar.Z
wget http://www.rhyolite.com/anti-spam/dcc/source/dcc-dccd.tar.Z
tar -zxvf dcc-dccd.tar.Z
cd dcc-dccd-1.3.2
./configure
make
make install


3. Modificaţi DCC pentru a rula ca demon
   

   nano -w /etc/dcc/dcc_conf

   asigurati-va ca DCCD_ENABLE este off si DCCIFD_ENABLE este on.

   DCCD_ENABLE=off
DCCIFD_ENABLE=on

   Pregatiti script-ul de start a serviciului

   
cd /etc/rc.d/init.d
ln -s /var/dcc/libexec/rcDCC DCC
chkconfig --add DCC
/etc/rc.d/init.d/DCC start

   si mai puneti un link spre un program zilnic de curatenie

   
cd /etc/cron.daily
ln -s /var/dcc/libexec/cron-dccd

4. Activati modulul in Spamassassin
   

   nano -w /etc/mail/spamassassin/local.cf

   si adaugati liniile

   
# DCC home folder
# comment it to disable
dcc_home /var/dcc

   respectiv

   nano -w /etc/mail/spamassassin/v310.pre

   si de-comentati (stergeti semnaul # de la inceputul liniei) linia ce activeaza DCC

   loadplugin Mail::SpamAssassin::Plugin::DCC

Detaliile de instalare sunt preluate din pagina http://www.rvskin.com/index.php?page=public/antispam

Bonus: spamurile lui Urban sunt deja înregistrate, aşa că folosirea filtrului v-ar fi de folos!

You are invited to a free live webcast:

Success Factors: What traditional business really needs to know about Web 2.0
Presented by Joshua Ross

http://oreilly.com/go/successfactors

The business world is experiencing successive waves of disruption caused by new
trends and technologies; from publishing to media and entertainment, software
development to financial services and healthcare, entire industries are being
transformed by the Internet.  With Web 2.0 technologies gaining traction, these
rates of change are likely to only increase as new forms of collaboration-enabled
by technology--unlock the creative capacity of people across the globe. Within
such an environment, learning and leadership are survival skills. 

While most organizations recognize the need to address these changes, their
responses are typically anemic and inclined to failure. Most strategies fails
for the same, simple reasons:

-A heavy reliance on outside expertise
-A basic failure to understand the shift in organizing principles and mindsets
that define Web 2.0 companies.  

Based on direct experience consulting in the field, and backed by O'Reilly's
thought leadership on Web 2.0, this webcast is for the rest of us: executives
and professionals working in "traditional" (non-Internet native) business trying
to take advantage of new trends. We'll explore the underlying organizing
principles and success factors in building and executing a Social Web strategy,
specifically:

-New ways of listening
-A focus on relationship building
-Creating "Open" strategies

===================
Attendance is limited, so register now. We'll send you a reminder before the
webcast. And please feel free to share this invitation with others.

Date: Thursday, July 10 at 10am PDT (17:00 GMT)
Cost: Free
Duration: 45-60 minutes
Meeting link: 
http://oreilly.com/go/successfactors

Teleconference dial-in:
(select the number that is closest to your location)
East Coast US: +1 617 231-0350 and pin 8136507
West Coast US: +1 213-455-0500 and pin 8136507

Questions? Please send email to 
webcast@oreilly.com

===================
About Joshua Ross

Joshua Ross, vice president of O'Reilly InPractice,  has been consulting with
businesses on digital strategy for over a decade. During that time, he has
overseen the launch of dozens of highly successful, enterprise-class ecommerce
sites, exchange platforms, and community sites. He has worked extensively with
start-ups to Fortune 500 companies on strategy and governance planning for
ebusiness.

Joshua comes with a deep background in online marketing and communications,
utilizing emerging social media technologies--community, blogging, virtual
worlds, and WOM, among others-to deliver highly successful, sustainable
marketing strategies. His focus over the last three years has been on applying
Web 2.0 principles to deliver competitive advantage to Global 2000 clients,
from new business model development to customer engagement and communication
strategies. Joshua has been a guest lecturer at Harvard University on information
design and human factors, and has spoken at conferences related to technology
and digital strategy. Past clients include Washington Mutual, Accenture,
Best Buy, Autodesk, and Polycom.  Joshua holds a degree with honors in Chinese
Studies from the University of California, Santa Cruz.

===================
About O'Reilly InPractice

O'Reilly InPractice offers consulting and training services to companies actively
interested in incorporating Web 2.0 practices into their businesses. From hands-on
training with new technologies to high-level strategic consulting, we help set
companies on a path to success in today's competitive, often unpredictable
business environment.

As a division of O'Reilly Media, O'Reilly InPractice is steeped in the
extraordinary business intelligence and vision long associated with the company.
From the earliest days of the Web, O'Reilly Media has served as the premier
source of information as well as a prescient catalyst for leading-edge
development, homing in on the technology trends that are shaping the worlds of
online business and culture.