PHP mail()

I have a php mail() script for my contact form on my website hosted on godaddy. It works when sending to other addresses, but when I try to send to one of my zoho mail accounts, I don't receive the email. My zoho account receives email fine for everything else so far. Is there something I have to enable in zoho configuration in order to get email from php, or some sort of headers my email needs for zoho to receive it?