How do I get my domain mail on iPhone?

How do I get my domain mail on iPhone?

Now that my emails are going through Zoho and not GoDaddy, how do I get email on my iPhone?  I know about the mobile access to Zoho, but it doesn't notify you when you get an email.  I can't login every 5 minutes to see if I have a message.  I've seen the directions to configure a zoho.com account on the iPhone, but that's not my domain email.

How do iPhone users get their domain email on their iPhones?

Thanks,
DJ