Disable Mail's "No Mail" Sound Effect

I have a script which checks for new mail every five minutes. However, due to the nature of this script, it plays the "No New Mail" sound every time it runs. Naturally, it gets quite irritating to hear the sound effect every five minutes. Fortunately, it is quite easy to disable the "No Mail" sound effect.

If you would like to automate this, you can use this AppleScript Application, otherwise, read on for the full run down:

Step 1: Quit Mail.app.

Step 2: Go to /Applications/Mail.app in Finder.

Step 3: Right click on the Mail application and select "Show Package Contents."

Step 4: In the Finder window that opens, go to ./Contents/Resources/No Mail.aiff.

Step 5: Make a backup copy of this audio file and replace it with an audio file containing silence. Make sure the name of the audio file is "No Mail.aiff".

Step 6: Open up Mail and check for new mail. You should no longer hear the lonely "No Mail" sound.

Download the script here.