oreilly.comSafari Books Online.Conferences.


SMTP Proxies, SMTP Protection, and HTTP, Virtually

by chromatic
Linux Newsletter for 07/28/2003

Hello, readers, and welcome to the Linux newsletter. This is a weekly dose of new, clever, and informative articles that occur on Here's the scoop:

If you've been following Dru Lavigne's FreeBSD Basics column (and, no matter which Unix you're using, you really should), you'll know all about proxies now. You're probably already aware of HTTP Proxies, but have you ever heard of an SMTP proxy? In SMTP Proxies, Dru explains what it is and why you'd want one.

Speaking of SMTP, we're proud to run the second piece of Dru Nelson's anti-spam case study. Defending Your Site Against Spam, Part 2 explains how he used blocklists to prevent spam from choking his network. The biggest help came from a fledgling trust network, which decides which senders (and raters) are trustworthy.

Finally, new author Russell Dyer delves into a popular-but-still-underused feature of Apache. Apache Virtual Hosts explains how a small company can save on servers and IP addresses and how an overworked web developer can keep the development versions of several sites straight, just by configuring Apache a little differently.

To subscribe to the Linux newsletter (or any O'Reilly Network newsletters), visit and select the newsletters you wish to receive in your user profile (you'll need to log in with your existing O'Reilly Network account -- if you don't yet have an account, you'll need to create one).

To change your newsletter subscription options, please visit and click the"Manage My Newsletters" link. For assistance, send email to

Weblog-wise, Steve Mallet takes advantage of the surging popularity of the wonderful Ruby language to promote RubyForge. Andy Oram asks "why is no one in the U.S. calling SCO on the carpet?" Andy Lester wonders "would you like to throw away your last five minutes of work?"

That's all for this week. Next week's articles will help you look better, feel younger, and possibly improve your software development practices.


Technical Editor
O'Reilly Network and Linux DevCenter Top Five Articles Last Week

  1. Defending Your Site Against Spam, Part 2
    Dru Nelson recently had spammers attempt to attack his network, but this time, he didn't notice until he checked the logs. Why? He's using qmail and Trustic. Read on to find out how they can protect you from unwanted e-mail.

  2. Terence Spies on Identity-Based Encryption
    Public key encryption has worked fairly well for decades, but its complexity has kept many people at bay. A new startup has revived a 20 year old idea that just may put encryption in the hands of the average user. Terence Spies, vice president of engineering at Voltage Security, recently spoke to us about Identity-Based Encryption.

  3. Simplify Your Life with Apache Virtual Hosts
    Not every web site needs its own server or IP address. Apache and HTTP 1.1 both allow different sites to share a single box and a IP address. Russell Dyer explains how virtual hosts can make your life easier as a web developer and a system administrator.

  4. The Essence of OpenBSD
    A thousand open source projects quietly produce excellent code under the radar. What goes on in these projects? How do new people join? What motivation is there? Cameron Laird and George Peter Staplin interview several core OpenBSD developers.

  5. Kapor's Thoughts on Desktop Linux
    Mitch Kapor examines what stands in the way of Linux as an end-user operating system. Daniel Steinberg reports on Kapor's keynote from OSCON 2003.

Return to the list of Linux Newsletters.

Return to the Linux DevCenter.

Linux Online Certification

Linux/Unix System Administration Certificate Series
Linux/Unix System Administration Certificate Series — This course series targets both beginning and intermediate Linux/Unix users who want to acquire advanced system administration skills, and to back those skills up with a Certificate from the University of Illinois Office of Continuing Education.

Enroll today!

Linux Resources
  • Linux Online
  • The Linux FAQ
  • Linux Kernel Archives
  • Kernel Traffic

  • Sponsored by: