Guide of troubleshooting of error (0x800CCC0F):
Symptom: A dialogue box appears with error message "Sending reported error (0x800CCC0F)" when user performs any kind of activity with receive or send email messages.
Alternative ways to resolve issue: This error is resolved through various methods i.e. depends on the nature & source of problem. Know all methods mentioned below:
1 - Check connection with Internet: At initial stage, outlook user is requested to check their connectivity status with internet. In case, you find interrupted service then contact to your ISP or network administrator.
2 - Account setting with MS Outlook account: Steps of account setting is varying from one version to another. So check the authenticity of account setting with connected MS Outlook version.
3 - Antivirus Setting: Bad setting with Antivirus program may hamper the service of ingoing and outgoing in email client. It is always advised to use trusted Antivirus program i.e. safe for your application.
4 - Priority with Firewall: For Outlook users, it is allowed to use firewall at medium level. With high level of priority, it may damage your Outlook database. Firewall is basically enabled to protect your system from malicious attack. To turn on firewall service in your system, consider some common things that are:
Outlook.exe (for Outlook)
Choose port 25 for Outgoing access (By default)
Choose port 110 for incoming access (By default)