Welcome to the AudibleMail thread.
AudibleMail is a simple little mod that plays a .wav file when you have mail.
I kept forgetting to check my mail, so I made an audio alert for myself.
I finally decided to share it in case there are other people with the same "problem memory" I have.
The sound can be changed simply by copying another .wav file into the AudibleMail directory, and renaming it AudibleMail.wav