In part one of this tutorial looked at installing and configuring greylistd alongside Exim to help combat the evils of Spam. In this second part I will look at getting some information out of greylistd — handy if you need to troubleshoot why the CEO’s “urgent” message hasn’t arrived yet!

When most people install a free software mail transport agent (MTA) they plumb for Postfix, Exim, qmail or Sendmail. Whilst these are all fine, they can be a little over the top for some smaller systems or systems where all you need is some kind of local MTA functionality. In these cases many people will install their favourite MTA anyway - but there are more lightweight alternatives.

Traditional methods of spam protection involve using Bayesian detection rules (usually via SpamAssassin) on messages after they have been accepted by your server. Most mail sysadmins may have encountered the constant cries from their users asking "can't you stop them sending it?". Of course you can't stop somebody sending a message but you can stop accepting them in the first place.

Nullmailer is a minimal MTA (Mail Transport Agent) that provides mail delivery services to programs (cron jobs, system integrity checkers, log inspectors, etc.) in a host that otherwise does not require a full MTA like Exim or Postfix.

I have played a lot with rTorrent and wTorrent (which I've already posted how to set up) and also ruTorrent and various Web UIs for rTorrent but I've came to the conclusion that the best way (for me at least) for remote Bittorrent download is Transmission Remote GUI - I've been using it for a few days now and love it.

In this issue of Free Software Magazine David Jacovkis reports from Colombia and explains why free software is an ethical choice. Colin McGregor interviews several key people in the GNU/Linux world as well as explaining how to get KDE looking fantastic. Then we have Terry Hancock covering the Open Hardware project and making a comprehensive list of Linux-friendly hardware. Steven Goodwin shares how much he saved by using free software for his great beer podcast, and Alan Berg entertains us with free software easter eggs, while Andrew Min will explain the basics of HTML... Monty Python style. Gary Richmond enlights us about touchpads and Google Firefox extensions you don't want to miss. For ultimate hackers, Gianluca Pignalberi manages to do sound filtering by using...

"Remote helpdesk" means you have remote control of a user's PC, and can operate it from your comfortable IT lair just as though you were sitting in front of it. So instead of trying to coach some poor user through their own PC surgery, you can take control of it and quickly figure out what's going on and set it right.

Remote Desktop Control displays the screen of another computer (via Internet or local area network) on a local screen. This type of software enables users to use the mouse and keyboard to control the other computer remotely. It means that a user can work on a remote computer as if he or she was sitting directly in front of it, regardless of the distance between the computers.

A security researcher has released zero-day code for a flaw in the Linux kernel, saying that it bypasses security protections in the operating system. The source code for the exploit was made available last week by researcher Brad Spengler on the Dailydave mailing list.