Outlook: Error 0x800C013B When You Attempt to Send a Message

When you try to send a message in Outlook Express, you may receive the following error message:

An unknown error has occurred. Protocol: SMTP, Port: 0, Secure(SSL): No, Error Number: 0x800C013B.

CAUSE
This behavior can occur if the Sent Items.dbx file is damaged.

RESOLUTION
To resolve this issue, rename the Sent Items.dbx file from the Outlook Express e-mail files:
Click Start, point to Find, and then click Files or Folders.
In the Named box, type Sent Items.dbx.
In the Look In box, click your primary hard disk (usually drive C), and then click Find Now.
Right-click the Sent Items.dbx file, and then click Rename.
Type Sent Items.old, and then click OK.
Restart Outlook Express. This action automatically creates a new Sent Items.dbx file.
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