Can not connect to Zoho mail server

Can not connect to Zoho mail server

I can not connect to zoho mail server (imap.zoho.com 72.5.230.99, smtp.zoho.com 74.201.154.90) use my BlackBerry 8900 in China. But I can access my mailbox via mail.zoho.com website, so how can I asscess zoho mail server by my BB 8900 in China, need help!

Thanks.