{
  "nodes": [
    {
      "name": "Every minute",
      "type": "n8n-nodes-base.cron",
      "typeVersion": 1,
      "parameters": {
        "triggerTimes": {
          "item": [
            {
              "mode": "everyMinute"
            }
          ]
        }
      },
      "id": "validate-sheet-email-deliverability-0"
    },
    {
      "name": "Read the email sheet",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "method": "GET",
        "url": "={{ 'https://sheets.googleapis.com/v4/spreadsheets/' + encodeURIComponent('YOUR_SPREADSHEET_ID') + '/values/' + encodeURIComponent(\"'Emails'!A:Z\") }}",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "googleSheetsOAuth2Api",
        "options": {
          "response": {
            "response": {
              "responseFormat": "json"
            }
          }
        }
      },
      "id": "validate-sheet-email-deliverability-1"
    },
    {
      "name": "Find changed email rows",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "parameters": {
        "mode": "runOnceForAllItems",
        "jsCode": "function plan({values,previous}) {\n  if (!Array.isArray(values) || !Array.isArray(values[0])) throw Error('Sheet needs headers');\n  const headers=values[0];\n  const column=name=>{const matches=headers.flatMap((v,i)=>v===name?[i]:[]);if(matches.length!==1)throw Error('Missing or duplicate '+name+' header');return matches[0]};\n  const emailColumn=column('Email'), statusColumn=column('Status');\n  const rows=values.slice(1).map((row,i)=>{if(!Array.isArray(row))throw Error('Invalid row');return {row:i+2,email:String(row[emailColumn]??'').trim(),status:String(row[statusColumn]??''),cells:row}});\n  const snapshot=rows.map(r=>r.cells);\n  if(previous==null)return {snapshot,items:[]};\n  if(!Array.isArray(previous))throw Error('Invalid previous snapshot');\n  const seen=new Set(),items=[];\n  for(let i=0;i<rows.length;i++){const r=rows[i];if(JSON.stringify(r.cells)===JSON.stringify(previous[i])||r.status.trim()||!r.email||seen.has(r.email))continue;seen.add(r.email);items.push({row:r.row,email:r.email});}\n  return {snapshot,items};\n}\n\nconst saved=$getWorkflowStaticData('node');const result=plan({values:$input.first().json.values??[],previous:saved.snapshot??null});saved.snapshot=result.snapshot;return result.items.map(item=>({json:item}));"
      },
      "id": "validate-sheet-email-deliverability-2"
    },
    {
      "name": "Select the next email",
      "type": "n8n-nodes-base.splitInBatches",
      "typeVersion": 3,
      "parameters": {
        "batchSize": 1,
        "options": {}
      },
      "id": "validate-sheet-email-deliverability-3"
    },
    {
      "name": "Validate the email",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "method": "GET",
        "url": "={{ 'https://api.mails.so/v1/validate?email=' + encodeURIComponent($json.email) }}",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "options": {
          "response": {
            "response": {
              "responseFormat": "json"
            }
          }
        }
      },
      "id": "validate-sheet-email-deliverability-4"
    },
    {
      "name": "Recheck the email sheet",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "method": "GET",
        "url": "={{ 'https://sheets.googleapis.com/v4/spreadsheets/' + encodeURIComponent('YOUR_SPREADSHEET_ID') + '/values/' + encodeURIComponent(\"'Emails'!A:Z\") }}",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "googleSheetsOAuth2Api",
        "options": {
          "response": {
            "response": {
              "responseFormat": "json"
            }
          }
        }
      },
      "id": "validate-sheet-email-deliverability-5"
    },
    {
      "name": "Prepare the status cell",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "parameters": {
        "mode": "runOnceForAllItems",
        "jsCode": "function match({values,current,sheetName,result,returnedEmail}){if(!Array.isArray(values)||!Array.isArray(values[0])||!current||!Number.isInteger(current.row)||current.row<2)throw Error('Invalid row');if(returnedEmail!==current.email)throw Error('Validation result does not match email');if(!['deliverable','undeliverable','risky','unknown'].includes(result))throw Error('Invalid validation result');const h=values[0],find=n=>{const a=h.flatMap((x,i)=>x===n?[i]:[]);if(a.length!==1)throw Error('Missing or duplicate '+n+' header');return a[0]};const e=find('Email'),s=find('Status'),row=values[current.row-1];if(!Array.isArray(row)||String(row[e]??'').trim()!==current.email||String(row[s]??'').trim())throw Error('Row changed before update');let col=s+1,letters='';while(col){col--;letters=String.fromCharCode(65+col%26)+letters;col=Math.floor(col/26)}if(typeof sheetName!=='string'||!sheetName.trim())throw Error('Missing sheet name');return{range:\"'\"+sheetName.replace(/'/g,\"''\")+\"'!\"+letters+current.row,values:[[result]]}}\n\nconst current=$('Select the next email').item.json;const response=$('Validate the email').item.json;if(response.error||!response.data)throw Error('Validation failed');return [{json:match({values:$input.first().json.values??[],current,sheetName:'Emails',result:response.data.result,returnedEmail:response.data.email})}];"
      },
      "id": "validate-sheet-email-deliverability-6"
    },
    {
      "name": "Write the deliverability status",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "method": "PUT",
        "url": "={{ 'https://sheets.googleapis.com/v4/spreadsheets/' + encodeURIComponent('YOUR_SPREADSHEET_ID') + '/values/' + encodeURIComponent($json.range) }}",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "googleSheetsOAuth2Api",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "valueInputOption",
              "value": "RAW"
            }
          ]
        },
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={{ JSON.stringify({values:$json.values}) }}",
        "options": {
          "response": {
            "response": {
              "responseFormat": "json"
            }
          }
        }
      },
      "id": "validate-sheet-email-deliverability-7"
    },
    {
      "name": "Confirm the status update",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "parameters": {
        "mode": "runOnceForAllItems",
        "jsCode": "if($input.first().json.updatedCells!==1)throw Error('Status write not confirmed');return $input.all();"
      },
      "id": "validate-sheet-email-deliverability-8"
    }
  ],
  "pinData": {},
  "connections": {
    "Every minute": {
      "main": [
        [
          {
            "node": "Read the email sheet",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Read the email sheet": {
      "main": [
        [
          {
            "node": "Find changed email rows",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Find changed email rows": {
      "main": [
        [
          {
            "node": "Select the next email",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Validate the email": {
      "main": [
        [
          {
            "node": "Recheck the email sheet",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Recheck the email sheet": {
      "main": [
        [
          {
            "node": "Prepare the status cell",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Prepare the status cell": {
      "main": [
        [
          {
            "node": "Write the deliverability status",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Write the deliverability status": {
      "main": [
        [
          {
            "node": "Confirm the status update",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Confirm the status update": {
      "main": [
        [
          {
            "node": "Select the next email",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Select the next email": {
      "main": [
        [],
        [
          {
            "node": "Validate the email",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "name": "Validate Sheet Email Deliverability",
  "active": false,
  "settings": {
    "timezone": "UTC",
    "executionOrder": "v1"
  }
}