How to resolve Outlook Express error 0x800CCC79

Sometimes, due to misconfiguration, when you try to send email from Microsoft Outlook express client, you get the following message, (Error 0x800CCC79)

 To rectify this problem, do one of the following,
  • Click to select the My server requires authentication check box, which is located in the Outgoing Mail Server properties in Outlook Express.
  • On the Exchange Server 5.5 computer, open the Internet Mail Service properties. On the Connections tab, click Accept Connections. Click to clear the Only from hosts using Authentication and the Clients can only submit if homed on this server check boxes.
  • On the Exchange 2000 server, enable Anonymous Access on the Authentication tab of the SMTP virtual server.
Please NOTE: 
  • After you enable anonymous access, Post Office Protocol version 3 (POP3) clients cannot send.
  • Do not combine the first option with either the second or third option.  

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