{
  "id": "06",
  "content": [
    {
      "type": "heading",
      "text": "MX, TXT, SPF, DKIM and DMARC"
    },
    {
      "type": "text",
      "html": "Domains often handle email as well as websites. <code>MX</code> records route incoming mail, while <code>TXT</code> records commonly verify services and publish email authentication policy."
    },
    {
      "type": "text",
      "html": "SPF, DKIM, and DMARC help receiving mail systems decide whether messages claiming to be from your domain are legitimate. They are important for deliverability and brand protection."
    },
    {
      "type": "callout",
      "style": "info",
      "html": "<strong>Practice:</strong> Treat email DNS as launch-critical. A website can look finished while email silently fails because MX or authentication records are missing."
    }
  ],
  "quiz": {
    "questions": [
      {
        "id": "q1",
        "type": "single",
        "text": "What do MX records do?",
        "options": [
          {
            "id": "a",
            "text": "Route incoming mail for a domain"
          },
          {
            "id": "b",
            "text": "Choose the page font"
          },
          {
            "id": "c",
            "text": "Generate campaign images"
          }
        ],
        "correct": [
          "a"
        ]
      },
      {
        "id": "q2",
        "type": "single",
        "text": "What do SPF, DKIM and DMARC support?",
        "options": [
          {
            "id": "a",
            "text": "Email authentication and deliverability"
          },
          {
            "id": "b",
            "text": "HTML headings only"
          },
          {
            "id": "c",
            "text": "Image cropping"
          }
        ],
        "correct": [
          "a"
        ]
      }
    ]
  }
}