diff --git a/packages/destination-actions/src/destinations/aws-s3/operations.ts b/packages/destination-actions/src/destinations/aws-s3/operations.ts
index 874e387b64..dd0fcb1417 100644
--- a/packages/destination-actions/src/destinations/aws-s3/operations.ts
+++ b/packages/destination-actions/src/destinations/aws-s3/operations.ts
@@ -25,60 +25,60 @@ function generateFile(payloads: Payload[], audienceSettings: AudienceSettings):
   const additionalColumns = payloads[0].additional_identifiers_and_traits_columns ?? []
 
   Object.entries(columnsField).forEach(([_, value]) => {
-    if (value !== undefined) {
+    if (![undefined, null, ''].includes(value)) {
       headers.push(value)
     }
   })
 
   additionalColumns.forEach((additionalColumn) => {
-    headers.push(additionalColumn.value)
+    if (![undefined, null, ''].includes(additionalColumn.value)) {
+      headers.push(additionalColumn.value)
+    }
   })
 
   const headerString = `${headers.join(audienceSettings.delimiter === 'tab' ? '\t' : audienceSettings.delimiter)}\n`
-
   const rows: string[] = [headerString]
 
   payloads.forEach((payload, index, arr) => {
     const action = payload.propertiesOrTraits[payload.audienceName]
 
     const row: string[] = []
-    if (headers.includes('audience_name')) {
-      row.push(enquoteIdentifier(String(payload.audienceName ?? '')))
+    if (![undefined, null, ''].includes(columnsField.audience_name)) {
+      row.push(encodeString(String(payload.audienceName ?? '')))
     }
-    if (headers.includes('audience_id')) {
-      row.push(enquoteIdentifier(String(payload.audienceId ?? '')))
+    if (![undefined, null, ''].includes(columnsField.audience_id)) {
+      row.push(encodeString(String(payload.audienceId ?? '')))
     }
-    if (headers.includes('audience_action')) {
-      row.push(enquoteIdentifier(String(action ?? '')))
+    if (![undefined, null, ''].includes(columnsField.audience_action)) {
+      row.push(encodeString(String(action ?? '')))
     }
-    if (headers.includes('email')) {
-      row.push(enquoteIdentifier(String(payload.email ?? '')))
+    if (![undefined, null, ''].includes(columnsField.email)) {
+      row.push(encodeString(String(payload.email ?? '')))
     }
-    if (headers.includes('user_id')) {
-      row.push(enquoteIdentifier(String(payload.userId ?? '')))
+    if (![undefined, null, ''].includes(columnsField.user_id)) {
+      row.push(encodeString(String(payload.userId ?? '')))
     }
-    if (headers.includes('anonymous_id')) {
-      row.push(enquoteIdentifier(String(payload.anonymousId ?? '')))
+    if (![undefined, null, ''].includes(columnsField.anonymous_id)) {
+      row.push(encodeString(String(payload.anonymousId ?? '')))
     }
-    if (headers.includes('timestamp')) {
-      row.push(enquoteIdentifier(String(payload.timestamp ?? '')))
+    if (![undefined, null, ''].includes(columnsField.timestamp)) {
+      row.push(encodeString(String(payload.timestamp ?? '')))
     }
-    if (headers.includes('message_id')) {
-      row.push(enquoteIdentifier(String(payload.messageId ?? '')))
+    if (![undefined, null, ''].includes(columnsField.message_id)) {
+      row.push(encodeString(String(payload.messageId ?? '')))
     }
-    if (headers.includes('space_id')) {
-      row.push(enquoteIdentifier(String(payload.spaceId ?? '')))
+    if (![undefined, null, ''].includes(columnsField.space_id)) {
+      row.push(encodeString(String(payload.spaceId ?? '')))
     }
-    if (headers.includes('integrations_object')) {
-      row.push(enquoteIdentifier(String(JSON.stringify(payload.integrationsObject) ?? '')))
+    if (![undefined, null, ''].includes(columnsField.integrations_object)) {
+      row.push(encodeString(String(JSON.stringify(payload.integrationsObject) ?? '')))
     }
-    if (headers.includes('properties_or_traits')) {
-      row.push(enquoteIdentifier(String(JSON.stringify(payload.propertiesOrTraits) ?? '')))
+    if (![undefined, null, ''].includes(columnsField.properties_or_traits)) {
+      row.push(encodeString(String(JSON.stringify(payload.propertiesOrTraits) ?? '')))
     }
 
     additionalColumns.forEach((additionalColumn) => {
-      //row.push(enquoteIdentifier(String(JSON.stringify(payload.propertiesOrTraits[additionalColumn.key]) ?? '')))
-      row.push(enquoteIdentifier(String(JSON.stringify(additionalColumn.key) ?? '')))
+      row.push(encodeString(String(JSON.stringify(payload.propertiesOrTraits[additionalColumn.key]) ?? '')))
     })
 
     const isLastRow = arr.length === index + 1
@@ -92,8 +92,28 @@ function generateFile(payloads: Payload[], audienceSettings: AudienceSettings):
   return rows.join('')
 }
 
-function enquoteIdentifier(str: string) {
+function encodeString(str: string) {
   return `"${String(str).replace(/"/g, '""')}"`
 }
 
-export { generateFile, enquoteIdentifier }
+function validate(payloads: Payload[], audienceSettings: AudienceSettings) {
+  const delimiter = audienceSettings.delimiter
+  const columns = payloads[0].columns
+  const additionalIdentifierColumns = payloads[0].additional_identifiers_and_traits_columns
+
+  // ensure column names do not contain delimiter
+  Object.values(columns).forEach((columnName) => {
+    if (columnName.includes(delimiter)) {
+      throw new Error(`Column name ${columnName} cannot contain delimiter: ${delimiter}`)
+    }
+  })
+
+  // ensure additional identifier column names do not contain delimiter
+  additionalIdentifierColumns?.forEach((column) => {
+    if (column.value.includes(delimiter)) {
+      throw new Error(`Column name ${column.value} cannot contain delimiter: ${delimiter}`)
+    }
+  })
+}
+
+export { generateFile, validate }
diff --git a/packages/destination-actions/src/destinations/aws-s3/syncAudienceToCSV/generated-types.ts b/packages/destination-actions/src/destinations/aws-s3/syncAudienceToCSV/generated-types.ts
index 53dbc322b3..3156b2054a 100644
--- a/packages/destination-actions/src/destinations/aws-s3/syncAudienceToCSV/generated-types.ts
+++ b/packages/destination-actions/src/destinations/aws-s3/syncAudienceToCSV/generated-types.ts
@@ -36,7 +36,7 @@ export interface Payload {
     /**
      * Name of column for the unique identifier for the message.
      */
-    messageId?: string
+    message_id?: string
     /**
      * Name of column for the unique identifier for the Segment Engage Space that generated the event.
      */
diff --git a/packages/destination-actions/src/destinations/aws-s3/syncAudienceToCSV/index.ts b/packages/destination-actions/src/destinations/aws-s3/syncAudienceToCSV/index.ts
index 34a3b4d467..75512d3b37 100644
--- a/packages/destination-actions/src/destinations/aws-s3/syncAudienceToCSV/index.ts
+++ b/packages/destination-actions/src/destinations/aws-s3/syncAudienceToCSV/index.ts
@@ -1,7 +1,7 @@
 import type { ActionDefinition } from '@segment/actions-core'
 import type { Settings, AudienceSettings } from '../generated-types'
 import type { Payload } from './generated-types'
-import { generateFile } from '../operations'
+import { generateFile, validate } from '../operations'
 import { S3CSVClient } from './s3'
 
 const action: ActionDefinition<Settings, Payload, AudienceSettings> = {
@@ -52,7 +52,7 @@ const action: ActionDefinition<Settings, Payload, AudienceSettings> = {
           description: 'Name of column for timestamp for when the user was added or removed from the Audience',
           type: 'string'
         },
-        messageId: {
+        message_id: {
           label: 'Message ID',
           description: 'Name of column for the unique identifier for the message.',
           type: 'string'
@@ -241,10 +241,9 @@ const action: ActionDefinition<Settings, Payload, AudienceSettings> = {
 }
 
 async function processData(payloads: Payload[], settings: Settings, audienceSettings?: AudienceSettings) {
+  validate(payloads, audienceSettings as AudienceSettings)
   const fileContent = generateFile(payloads, audienceSettings as AudienceSettings)
-
   const s3Client = new S3CSVClient(settings.s3_aws_region, settings.iam_role_arn, settings.iam_external_id)
-
   await s3Client.uploadS3(settings, audienceSettings as AudienceSettings, fileContent)
 }