Task ‘pop.domain.com – Sending’ reported error (0x800CCC81) : ‘Unknown Error 0x800CCC81’

• 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 POP3 server is damaged.
• The configuration of your AV software is incorrect.
  Outlook (Express) was removed from the computer or the installation is damaged.
• The configuration of your personal firewall software is incorrect.