How to Fix Outlook Error: 0x800ccc15

The message could not be sent to the SMTP server. The transport error code was 0x800ccc15. The server response was not available

  • You are not connected to the Internet or a network, or your mail server is temporarily unavailable.
  • Your account settings are incorrect.
  • Your user profile in Outlook is damaged.
  • An e-mail item on your SMTP server is damaged.
  • The configuration of your Antivirus software is incorrect.
  • Outlook was removed from the computer or the installation is damaged.
  • The configuration of your personal firewall software is incorrect.