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
-
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.
-
Piviti Seeks Funding
Donors will get to vote on new features for the free video editor.
-
Debian Tech Committee Votes for systemd
Debian project puts init out to pasture and says no to Ubuntu's Upstart.
-
The Mask: Scary New Face of Internet Intrusion
Ultra-sophisticated attack tool might have originated from a state-sponsored intelligence service.
-
Epoch 1.0 Released
New alternative for init comes with a small footprint and minimal configuration.
-
Wayland 1.4 Challenges X11
X marks the target for the next-generation windowing system.
-
Red Hat Adopts CentOS
Super-clone CentOS Linux gets beamed up to the mother ship.
-
W3C Promotes Media Source Extensions
HTML technology will enable new video editing and playback options.