Group email not working for Gravity Form

Group email not working for Gravity Form

I have a group email, underwriting@tranzpay.io.   When I set my gravity form notification to send an email to that address it doesn't arrive.  However, if i send and email to underwriting@tranzpay.io from my personal gmail account, it arrives fine.

I have also changed the notification email in gravity forms to my personal email and it also works fine...so that rules out that.

Not sure if it is a gravity forms issue or a zoho group emali issue.

Here are my logs from Gravity Forms showing the email is being sent:

2019-10-23 1:47:55.459183 - DEBUG --> GFCommon::send_notification(): Starting to process notification (#5beb4479030ad - Admin Notification). 
2019-10-23 1:47:55.460181 - DEBUG --> GFCommon::send_email(): Sending email via wp_mail(). 
2019-10-23 1:47:55.460228 - DEBUG --> Array
(
    [to] => underwriting@tranzpay.io
    [subject] => New submission from tranzpay.io
    [message] => <html>
	<head>
		<title>New submission from tranzpay.io</title>
	</head>
	<body> 
An online application has been submitted for:<br />