I recently set up my email to be served through Zoho.

Since doing this, customers are not receiving some of our automated emails from Shopify itself. Our initial email that confirms their purchase goes through but our Shipping Notification that is automatically sent out upon fulfillment is not going through. Sometimes we get a notice that it's been classified as spam, sometimes nothing.

I can send/receive email via Outlook on my desktop and I can send/receive email via my iPhone Mail app. No issues there, it only seems to be an issue with Shopify's automation.

Please help!