Common Email Errors / Solutions Netscape Mail - "Unable to open outgoing mail file" This error is caused by an incorrect mail file setting. Identify and correct your setting by completing the instructions below: - Open Netscape Navigator.
 - From the Options menu, select Mail and News Preferences.
- Select the Composition tab.
 - Delete the contents of the Mail File field.
- In the Mail File field, type c:\windows\Sent
- Click OK to exit.
- From the File menu, select Exit.
- Restart Netscape Navigator.
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