Title should have been

Preview emails only send from real emails

Preview emails send from a real address r*********n@me.com but when we use a forwarding address managed within Shopify s******e@zerowastesupply.co.uk the email doesn’t send or at least is not received. 

We can send emails from this address from within Shopify. We can send to this address from iPhone mail. 

In summary using an address managed as a forwarding address as a preview sending address results in no email being received. 

Nothing is going to junk so it is stuck or just not sending. 

Help!!

Thanks