Error while configure zoho mail on outlook2013

Hi ad,
I need your help. Now i configure zoho mail in outlook 2013 and i have a error below. Pls show me how to fix it:

Send test e-mail message: The operation timed out waiting for a response from the sending (SMTP) server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).

Thanks so much.