Please check the following if your are getting the below error when sending email from Outlook express
"Your server has unexpectedly terminated the connection. Error Number: 0x800CCC0F"
To troubleshoot the above error please check the following :-
1) Open the email client (Outlook Express) and click on "Tools" and "Accounts".
2) Click on "Mail account" from where you are getting error. Then Click on "Properties".
3) Click on "Advance option " and make sure the check boxes in front of "This server
requires a secure connection (SSL)" is unchecked. If that checkbox is enabled
please uncheck that check box and restart your Outlook Express again.
4) Please check now by sending a test email from that email account.