What does Charly’s recent two-week vacation in Holland have in common with an SSH session? Nothing at all, at first sight. And therein lies a tale.

Spammers don’t just send email. They exploit discussion forums and blogs, posting pseudo-messages full of links to dupe search engines. A Perl script cleans up the mess.

Browsers live in continual danger of compromise by a malicious site. An intermediate proxy combined with a virus scanner can help.

While going about his normal duties, Linux Magazine author Charly Kühnast was hit with a mean attack. Charly’s separate anti-spam server, which sits in front of his mail server, saved him from the mail storm.

Today’s rootkits infiltrate a target system at kernel level, thus escaping unwanted attention from administrators. Read on for a practical look at how a kernel rootkit really works.

The Postfix Policyd plugin fights spam using techniques such as greylisting, source detection, volume measurements, blacklisting, and HELO rotation detection.