Change the New Mail Sound in Opera
To have Opera play your preferred sound file when new mail has come in:
- Select Mail | Manage accounts... from the menu.
- Highlight the account whose new mail sound you want to change.
- Click Edit.
- Go to the Incoming tab.
- Make sure Play sound when new messages arrive is checked.
- Use the Choose button to select a WAV file to be played upon incoming mail.
- Click OK.