I have a form that can accept data by email. So I decided to test the  Form Alias Email ID. In gmail I set-up the form's email for forwarding. Gmail requires verifcation of this by sending an email with a code. I had assumed it would arrive in the form where I could find the code. It never arrives. Just to make sure, I set-up forwarding to another email account I hold and the verification code arrived instantly. I'm suspecting that ZOHO email servers are misdirecting or blocking this email.