Adding Handbrake to Ubuntu  

Handbrake is a great DVD ripper. Unfortunately, currently there is no deb version on the Handbrake website. Here is a how to for installing Handbrake on Ubuntu.

Creating Bridged Interfaces  

Sometimes it's necessary to have multiple network interfaces appear as a single interface to the operating system. I use bridges to help with networking, I can take an underutilized server and add a virtual machine that I can test on my local network without reconfiguring every computer to access a different subnet. It also can simplify firewall creation.

This tutorial was completed on Ubuntu 10.04LTS, there is no guaranty it will function as expected on any other version or OS. There will be an updated version, for Ubuntu 12.04LTS, made available when time permits.

This tutorial will show how to get "dovecot-antispam" which watches a defined spam folder (defaults to "SPAM") working. It works together with a spam system that classifies each message as it is delivered. When the message is classified as spam, it shall be delivered to the spam folder, otherwise via the regular filtering file the user may have (maildrop, sieve, ...). Now the user has everything classified as spam in the special spam folder, everything else where it should be sorted to.

This is not enough because our spam scanner needs training. We’ll occasionally have false positives and false negatives. Now this is the point where the dovecot antispam plugin comes into play. Instead of moving mail into special folders or forwarding them to special mail addresses for retraining, the plugin offers two actions for the user:

1. moving mail out of the SPAM folder and

2. moving mail into the SPAM folder.

The dovecot plugin watches these actions (and additionally prohibits APPENDs to the SPAM folder, more for technical reasons than others) and tells the spam classifier that it made an error and needs to re-classify the message (as spam/not spam depending on which way it was moved.)

DSPAM in Postfix  

The most seamless way to integrate DSPAM into Postfix is as a content filter. This requires very little work, and allows the two to communicate seamlessly. You may want to first read Postfix's FILTER_README from the Postfix source tree to familiarize yourself with what we're doing. In a nutshell, Postfix sends all mail to the content filter instead of delivering it. It's the content filter's job to then pass the [modified] message back into Postfix (called reinjection) or do something else with the message. By default, DSPAM will quarantine what it believes is spam, but it can be configured to tag it instead. We will use DSPAM's LMTP and SMTP functionality to integrate the two seamlessly together like so:

Postfix(LMTP) ⇒ (LMTP)DSPAM{SMTP} ⇒ (SMTP}Postfix ⇒ {Delivery Agent}

Join An Ubuntu Machine To A Windows Domain  

I had been hoping to accomplish this for some time now. At work we work under a Windows domain and I have a Ubuntu test machine that I have been hoping to join to that domain. Finally, thanks to Likewise-Open5, it happened. And, believe it or not, it’s not all that difficult.

Oh sure you can use Samba to take this task on, but you better be prepared for some serious configuration and work. With Likewise-Open5 that job is made significantly easier. Now I understand that with the upcoming major release of Samba, joining a domain should be much simpler. But with the tools we have now, Likewise-Open5 is your best bet. In this article I will show you how to join a Windows domain using a Ubuntu box.


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