Check for valid Mautic contact email

{
  "id": 86,
  "name": "Check for valid Mautic contact email",
  "nodes": [
    {
      "name": "If is not new contact",
      "type": "n8n-nodes-base.if",
      "position": [
        780,
        460
      ],
      "parameters": {
        "conditions": {
          "string": [
            {
              "value1": "={{$json[\"mautic.lead_post_save_new\"]}}",
              "operation": "isEmpty"
            }
          ]
        }
      },
      "typeVersion": 1
    },
    {
      "name": "On Contact Identified",
      "type": "n8n-nodes-base.mauticTrigger",
      "position": [
        600,
        460
      ],
      "webhookId": "a3ee0f93-2870-44e2-bb2f-0175433263b3",
      "parameters": {
        "events": [
          "mautic.lead_post_save_new"
        ],
        "authentication": "oAuth2"
      },
      "credentials": {
        "mauticOAuth2Api": {
          "id": "54",
          "name": "Mautic account"
        }
      },
      "typeVersion": 1
    },
    {
      "name": "extract ...