Unable to connect to ssl://smtp.zoho.com

Unable to connect to ssl://smtp.zoho.com

Hi,
I have a zoho email account and I am trying to configure it in opencart for SMTP authentication for sending mails. But I am getting the following error.

PHP Warning:  fsockopen(): unable to connect to ssl://smtp.zoho.com:465 

But the same is working if I am using google SMTP & authentication. Can anyone help me with this.

Thanks,
Pritam Dehingia