my email has stopped working, I am a complete novice know nothing about computers. I am not receiving or sending emails and I cannot delete, it just not working. this is the error message I get

Unable to send or receive messages for the *** Email address is removed for privacy ***  account. Header download for the 'Sent Items' folder did not complete. Could not update cached message flags with IMAP server.

Server Response: UID FETCH failed

Server: 'imap.telstra.com'

Windows Live Mail Error ID: 0x800CCCD2

Protocol: IMAP

Port: 993

Secure(SSL): Yes

could someone please help me