I have received and sent many emails until yesterday when I can receive but not send.
The following is the error message from outlook express:
The connection to the server has failed. Account: 'Terence Ho - QUIKGENIUS', Server: 'mail.quikgenius.com', Protocol: SMTP, Port: 25, Secure(SSL): No, Socket Error: 10061, Error Number: 0x800CCC0E
Was there a change in settings recently?