Defeat spam with Postgrey by greylisting and whitelisting incoming mail
Hail Mail
Vendors continue to develop new defenses against spam, one of the Internet’s most notorious pests. In this article, we integrate Postgrey with the Postfix mail server for a greylisting and whitelisting solution.
Spammers flood mail servers with unwanted email every second of every day just as fast as their software allows. Ham (solicited email, as opposed to unsolicited email), on the other hand, is conservatively estimated to be only around 5 to 10 percent of the email on the Internet as a whole (depending on which study you believe). Spammers continue to send unsolicited email because there’s something in it for them – namely, profit gleaned from recipients who unwittingly click on links in email messages and then buy pharmaceutical products and the like. It’s been said that if no one clicked, no spam would be left.
Read full article as PDF:
Price $2.95
Direct Download
Read full article as PDF:
Price $2.95
Tag Cloud
News
-
KDE Announces Software Compilation 4.13
New release comes with better semantic search and improvements to Kontact.
-
Coverity: Open Source Code has Fewer Defects
Annual code quality report shows FOSS is more secure at all project size levels.
-
An Even Smaller Raspberry Pi
The Raspberry Pi Foundation has announced an even smaller version of the tiny computer that will fit into a DIMM slot.
-
Freaky Privilege Escalation Attack
A new class of problems lets a malicious app pre-configure an invisible privilege update.
-
Facebook Rolls Out New PHP-like Programming Language
New Hack language adds static typing and other conveniences.
-
Fedora Announces Innovative Crytography Policy System
New crypto policy system will offer easier configuration and more uniform security.
-
Shuttleworth Calls for Declarative Firmware
Ubuntu founder denounces insecurity in proprietary, close-source software blobs.
-
New TLS Attack Takes the S out of HTTPS
Vulnerability affects many Linux web servers
-
Munich Adopts Kolab
The Bavarian capital shuns Microsoft, Google, and other alternatives to implement an open source groupware solution.
-
Canonical Announces Ubuntu Smartphones
Phone vendor partnerships bring Mark Shuttleworth's dream of Ubuntu on a phone a step closer to reality.