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Method 1: Check SMTP Server Settings
Open Windows Live Mail:
Launch Windows Live Mail on your computer.
Check Account Settings:
Go to "Accounts" or "Email Accounts" in the menu.
Select the Email Account:
Choose the email account associated with the error.
Verify SMTP Settings:
Ensure that the SMTP server settings are correct.
The outgoing server (SMTP) should be set to the correct address (e.g., smtp.yourprovider.com).
The port number should be set to the appropriate value (commonly 587).
Check Authentication:
Verify that the authentication method is set to use the same settings as the incoming mail server.
Save Changes:
After making any necessary changes, save the settings and close the window.
Restart Windows Live Mail:
Close and reopen Windows Live Mail to apply the changes.

Method 2: Disable Firewall or Antivirus
Temporarily Disable Firewall/Antivirus:
Sometimes, security software can block email communication. Temporarily disable your firewall or antivirus program and check if the error persists.
Test Sending Emails:
Try sending an email while the security software is disabled. If it works, consider adjusting the software settings to allow Windows Live Mail.

Method 3: Repair or Reinstall Windows Live Mail
Repair Windows Live Mail:
Open the "Programs and Features" or "Add/Remove Programs" in the Control Panel.
Locate Windows Live Essentials or Windows Essentials, right-click, and choose "Repair."
Reinstall Windows Live Mail:
If repairing doesn't solve the issue, uninstall Windows Live Essentials or Windows Essentials and then reinstall it.

Regards,
Peter