There are a number of resources for identifying what email error messages mean.
http://www.modemhelp.net/oeerrors/oe.shtml covers those errors arising when using a modem,
while http://isdn.modemhelp.net/ covers ISDN. Error: [ Your server has unexpectedly terminated the connection. Possible causes ....Number 0X800CCC0F ]
Situation: When you attempt to send or receive email, you see one of the following error messages:
[ Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Account mail xxxxxx. Server POP3 xxxxx. antivirus Protocol Pop 3. Port 110. Secure (SSL) No. Error. Number 0X800CCC0F ]
[ The TCP/IP connection was unexpectedly terminated by the server. (Account: POP3 Server: Error Number:0x800ccc0f ]
Solution: There are several possible reasons for this to happen. For additional information, see the following: Check your settings in your anti virus and/or firewall
