The Sysadmin’s Daily Grind: Policyd
TURNED DOWN!
The Postfix Policyd plugin fights spam using techniques such as greylisting, source detection, volume measurements, blacklisting, and HELO rotation detection.
Charly Kühnast is a Unix System Manager at the data-center in Moers, near Germany’s famous River Rhine. His tasks include ensuring firewall security and availability and taking care of the DMZ (demilitarized zone). I’ve added many bits and bobs to my tried and trusted Postfix in the course of the years – Spamassassin and virus filters, for example. The latest member in the exclusive club of Postfix add-ons is Policyd. The Policyd tool does not use the content_filter mechanism to integrate with Postfix, in contrast to many other external tools. Instead, Policyd prefers the check_policy_service, which is available in Postfix 2.2 or newer. This gives me the ability to slot Policyd into my existing ruleset at a location that makes sense. I don’t need to send spam that has been rejected for other reasons to the policy daemon. The current release of the Policyd C program is version 1.73. You can download Policyd from [1], and installing the daemon is easy. After unpacking, just enter gmake build gmake install in the policyd directory. MySQL is also required. Policyd gives you a SQL script that automatically creates the required tables. To finish off, you need to create a cron job:
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters
Support Our Work
Linux Magazine content is made possible with support from readers like you. Please consider contributing when you’ve found an article to be beneficial.
News
-
Kubuntu Focus Goes Ultra
The Kubuntu Focus team has upped the performance ante of its M2 and Zr laptops with the latest, greatest CPUs from Intel.
-
Linux Gamers May Soon See Less Mouse Lag in KDE Plasma
Gamers using KDE’s Plasma desktop have been suffering from a slight input delay in mouse movement that could lead to getting fragged.
-
Three Lines of Code Improve Linux Storage Performance
A developer changed three lines of code, giving Linux storage performance a 5% bump.
-
AUR Hit Again with Malicious Packages
Once again the Arch User Repository is plagued by a high volume of malicious packages.
-
Alpine Linux 3.24 Features Fresh Desktops and a Newer Kernel
If you're a fan of Alpine Linux, it's time to upgrade because the latest version has been released with KDE Plasma 6.6, Gnome 50, and Linux kernel 6.18 LTS.
-
EU Open Source Strategy Plays Key Role in Tech Sovereignty Package
Comprehensive measures adopted by the European Commission aim to reduce dependency on non-EU countries.
-
Linux Foundation Report Indicates AI Driving Tech Hiring
Within growing security and skills gaps, AI has been found to be a positive driving force behind tech hiring trends in Europe.
-
United Nations Open Source Portal Goes Live
A new open source portal seeks to coordinate and scale open source efforts across the United Nations system.
-
KDE Linux Drops AUR
KDE Linux developers have dropped the Arch User Repository from the build pipeline due to security concerns; other distributions should consider doing the same.
-
California May Exempt Linux from Its Age-Verification Law
After backlash from the Linux community, California may be backing off on its promise to force all operating systems to verify age, but one platform may still have to comply.