Unable to send/receive mail

I have been unable to send and receive email from Windows Mail for the last
3 weeks and this is affecting my business. The following error message seems
to be common among other posters here as well:
The connection to the server has failed. Subject 'Re: follow up query from
Ian Escario - ', Account: 'mail.ianescario.com', Server:
'mail.ianescario.com', Protocol: SMTP, Port: 25, Secure(SSL): No, Socket
Error: 10060, Error Number: 0x800CCC0E

Other mails in yahoo/hotmail are working normally and internet browsing is
normal. Please advise.
Thank you.
Ian Escario