How do I play MP3 files in Google Mail?
When you receive an MP3 file as an attachment to any message, Google Mail inserts a Play link next to the attachment icon. Click Play to launch our Flash player in a new window and use the volume slider and Pause function to control playback. If you would like to download the MP3 attachment to your computer, simply click the Download link at the bottom of your message. You will need to have the latest version of Flash installed on your computer to use the Play link. You can download the free Flash Player from Adobe’s site at http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash.