cant user outlook to check email in my server

Hi , few day ago my server got a problem , user can read and send email pop3 account from cpanel webmail but they can't use outlook to send email . This is a out look error message :
The connection to the server has failed. Account: 'webmind', Server: 'mail.wm219.com', Protocol: SMTP, Port: 25, Secure(SSL): No, Socket Error: 10060, Error Number: 0x800CCC0E

any body know what happend ? i am using redhat , cpanel,Mail Server (Exim) , POP3 Server (cppop)
Thank you for any advise .

 

 

 

 

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