exim mail

hello,

i need some help here, here is my story..
i have 1 centOS server for webhosting, i have been using it for almost 1 month and having no issue with sendmail. but today i tried to send email with my outlook express (i always use it) and i was shock that there was an error when sending it.
here is the log that outlook gave.

An unknown error has occurred. Subject 'hello', Account: 'sales', Server: 'mail.mydomain.com', Protocol: SMTP, Port: 25, Secure(SSL): No, Error Number: 0x800CCC0B
so anyone know why? as i didnt touch the server and the problem just comes up exim mail

thanks in advance ...

 

 

 

 

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