Block Attachments in Postfix

One of our clients requested that we block specific email attachments that come in – their large network was starting to suffer under the storm of non-work emails flying around the company – funny video clips, songs, etc, etc. Not only that, several gullible people had infected their PCs with viruses and malware.

Luckily, blocking specific mail attachments in Postfix is pretty straightforward and only takes a minute or two to set up.
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Make Ubuntu Start Up Faster on Multi-Core Computers

This is a nice quick one. I run an Ubuntu quad-core at home and was looking to find a way to get it to start up faster by making better use of the multiple cores. So, I was looking through /etc/init.d/rc, which is a config file for the program that handles the startup and shutdown of daemons on an Ubuntu box, and found this line:
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Is Your Sound Very Soft in Ubuntu?

Ever since Ubuntu 7.10, my sound in Ubuntu has been very muted. Normally I just shrugged and jacked the volume up, however recently I was forced to use headphones to hear my music and I noticed that the sound was unbearably soft. I did a bit of looking around, and found the solution here: https://answers.launchpad.net/ubuntu/+question/15851:

try running alsamixer in a console and check everything is unmuted and maxed. (use arrow keys to move/adjust , M key to mute/unmute and ESC to save and exit)

Worked 100% for me, though that’s because I’m using ALSA as my playback device.