Webmail does not load with dns redirect of mail.mydomain.com

Webmail does not load with dns redirect of mail.mydomain.com

I want to have mail.<mydomain>.com redirect to mail.zoho.com. I have set up the DNS CNAME entry in GoDaddy's control panel and when I type mail.<mydomain>.com it redirects properly to mail.zoho.com.  The problem is that it does not load anything? Nothing, nada, zilch. I did a view source and there is nothing there in the document. Not a header or anything. I've tested in both Chrome and FireFox.

What am I doing wrong??

Thanks,
Dan