Hardening Postfix

While there are plenty of good (and not so good) anti-spam solutions available, most of them cost a bit of money in terms of purchasing and licensing fees. Even without a dedicated appliance, there are several ways you can harden the Postfix MTA against spam and other internet nasties. In this article, we’re going to look at some ways of hardening postfix that I’ve found effective. Continue reading Hardening Postfix

Migrating spamassassin from db files to MySQL

In this post, we’ll take a look at how to migrate spamassassin from the default db files to a MySQL database. The assumption is that you have a working mail server that already does spam scanning and where spamassassin stores its information in the default db files. In order to improve speed, especially for auto-expiry but certainly also for spam filtering itself, it is advisable to store the data in a faster database. Continue reading Migrating spamassassin from db files to MySQL

Using postfix as a front-end for MS Exchange

This article is as much a “how to” as it is for myself to document how I built a postfix front-end mail server for MS Exchange and integrated spam and virus scanning. The base for this server is a HP DL360, running openSUSE Linux 11.3., but it should work for most other distributions out there. It assumes you already have a running installation of Linux. We’ll be using postfix, amavisd-new, clamav and spamassassin.
Continue reading Using postfix as a front-end for MS Exchange