What JSON LD syntax to use to display a company icon with an email in Google Inbox/Gmail

Question

When using json ld to markup an email, what JSON LD schema must be used to display a company icon with your email in Google Inbox/Gmail.

I've tried setting multiple props as follows, but Google does not recognise the metadata.

    <script type="application/ld+json" >
        {
            "@context": "http://schema.org",
            "@type": "EmailMessage",
            "description": "Test!",
            "image": "https://apiant.com/appResources/icons_large/shopify.png",
            "thumbnailUrl": "https://apiant.com/appResources/icons_large/shopify.png",
            "sender": {
                "@type": "Organization",
                "name": "name",
                "logo": "https://apiant.com/appResources/icons_large/shopify.png",
                "brand": {
                    "name": "name"
                }
            }
        }
    </script>

What am I doing wrong?

Relevant docs:

• http://developers.google.com/gmail/markup/reference/formats/json-ld‌​.
• http://schema.org/EmailMessage

Answer 1

AFAIK, the only way is to create a Gmail or Google Apps account with the same email as the sender email and add a photo to that profile:

https://postmarkapp.com/blog/how-to-easily-add-a-sender-image-to-gmail#adding-a-sender-image-to-gmail