mail.html

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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="application/adaptivecard+json">
{
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "type": "AdaptiveCard",
    "version": "1.0",
    "originator": "",
    "body": [
        {
            "size": "large",
            "text": "Hello Actionable message",
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            "type": "Action.InvokeAddInCommand",
            "title": "Open Actionable Messages Debugger",
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            "desktopCommandId": "amDebuggerOpenPaneButton"
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}
</script>
</head>
If the card doesn&#39;t appear, <a target="_blank" href="https://store.office.com/app.aspx?assetid=WA104381686&productgroup=Outlook&mktvid=PN102957641&mktcmpid=sendmailsample"/>install Actionable Messages Debugger Outlook add-in</a> to debug the issue.
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