diff --git a/infrastructure/terraform/modules/eventpub/README.md b/infrastructure/terraform/modules/eventpub/README.md
index 8cb9ce9..8a88106 100644
--- a/infrastructure/terraform/modules/eventpub/README.md
+++ b/infrastructure/terraform/modules/eventpub/README.md
@@ -43,6 +43,7 @@
 | Name | Source | Version |
 |------|--------|---------|
 | <a name="module_s3bucket_event_cache"></a> [s3bucket\_event\_cache](#module\_s3bucket\_event\_cache) | https://github.com/NHSDigital/nhs-notify-shared-modules/releases/download/3.0.3/terraform-s3bucket.zip | n/a |
+| <a name="module_sqs_queue"></a> [sqs\_queue](#module\_sqs\_queue) | https://github.com/NHSDigital/nhs-notify-shared-modules/releases/download/3.1.4/terraform-sqs.zip | n/a |
 ## Outputs
 
 | Name | Description |
diff --git a/infrastructure/terraform/modules/eventpub/iam_role_lambda.tf b/infrastructure/terraform/modules/eventpub/iam_role_lambda.tf
index d53bd25..c6d5d5f 100644
--- a/infrastructure/terraform/modules/eventpub/iam_role_lambda.tf
+++ b/infrastructure/terraform/modules/eventpub/iam_role_lambda.tf
@@ -81,6 +81,22 @@ data "aws_iam_policy_document" "lambda" {
     ]
   }
 
+  statement {
+    sid    = "AllowSQSInput"
+    effect = "Allow"
+
+    actions = [
+      "sqs:ReceiveMessage",
+      "sqs:DeleteMessage",
+      "sqs:GetQueueAttributes",
+      "sqs:ChangeMessageVisibility",
+    ]
+
+    resources = [
+      module.sqs_queue.sqs_queue_arn,
+    ]
+  }
+
   statement {
     sid    = "KMSCloudwatchKeyAccess"
     effect = "Allow"
diff --git a/infrastructure/terraform/modules/eventpub/lambda/eventpub/src/index.js b/infrastructure/terraform/modules/eventpub/lambda/eventpub/src/index.js
index 6c305a5..1ae58f0 100644
--- a/infrastructure/terraform/modules/eventpub/lambda/eventpub/src/index.js
+++ b/infrastructure/terraform/modules/eventpub/lambda/eventpub/src/index.js
@@ -95,15 +95,19 @@ async function sendToDLQ(events) {
     }
 }
 
-exports.handler = async (snsEvent) => {
-    console.debug(`Received SNS event with ${snsEvent.Records.length} records.`);
+exports.handler = async (sqsEvent) => {
+    console.debug(`Received SQS event with ${sqsEvent.Records.length} records.`);
 
     if (THROTTLE_DELAY_MS > 0) {
         console.info(`Throttling enabled. Delaying processing by ${THROTTLE_DELAY_MS}ms`);
         await new Promise(res => setTimeout(res, THROTTLE_DELAY_MS));
     }
 
-    const records = snsEvent.Records.map(record => JSON.parse(record.Sns.Message));
+    const records = sqsEvent.Records
+        .map(record => record.body)
+        .map(JSON.parse)
+        .map(record => record.Message)
+        .map(JSON.parse);
     const validEvents = records.filter(validateEvent);
     const invalidEvents = records.filter(event => !validateEvent(event));
 
diff --git a/infrastructure/terraform/modules/eventpub/lambda_function.tf b/infrastructure/terraform/modules/eventpub/lambda_function.tf
index db7f925..2610c38 100644
--- a/infrastructure/terraform/modules/eventpub/lambda_function.tf
+++ b/infrastructure/terraform/modules/eventpub/lambda_function.tf
@@ -6,7 +6,7 @@ resource "aws_lambda_function" "main" {
   handler     = "index.handler"
   runtime     = "nodejs22.x"
   publish     = true
-  memory_size = 128
+  memory_size = 512
   timeout     = 20
 
   filename         = data.archive_file.lambda.output_path
@@ -28,3 +28,18 @@ resource "aws_lambda_function" "main" {
     }
   }
 }
+
+resource "aws_lambda_event_source_mapping" "sqs_to_lambda" {
+  event_source_arn                   = module.sqs_queue.sqs_queue_arn
+  function_name                      = aws_lambda_function.main.function_name
+  batch_size                         = 5000
+  maximum_batching_window_in_seconds = 1
+  function_response_types = [
+    "ReportBatchItemFailures"
+  ]
+
+  scaling_config {
+    maximum_concurrency = 20
+  }
+}
+
diff --git a/infrastructure/terraform/modules/eventpub/lambda_permissions_sns_event_cache.tf b/infrastructure/terraform/modules/eventpub/lambda_permissions_sns_event_cache.tf
deleted file mode 100644
index ad473e9..0000000
--- a/infrastructure/terraform/modules/eventpub/lambda_permissions_sns_event_cache.tf
+++ /dev/null
@@ -1,7 +0,0 @@
-resource "aws_lambda_permission" "sns_lambda" {
-  statement_id  = "AllowExecutionFromSNS"
-  action        = "lambda:InvokeFunction"
-  function_name = aws_lambda_function.main.function_name
-  principal     = "sns.amazonaws.com"
-  source_arn    = aws_sns_topic.main.arn
-}
diff --git a/infrastructure/terraform/modules/eventpub/module_sqs_queue.tf b/infrastructure/terraform/modules/eventpub/module_sqs_queue.tf
new file mode 100644
index 0000000..08f2945
--- /dev/null
+++ b/infrastructure/terraform/modules/eventpub/module_sqs_queue.tf
@@ -0,0 +1,34 @@
+module "sqs_queue" {
+  source = "https://github.com/NHSDigital/nhs-notify-shared-modules/releases/download/3.1.4/terraform-sqs.zip"
+
+  aws_account_id            = var.aws_account_id
+  component                 = var.component
+  environment               = var.environment
+  project                   = var.project
+  region                    = var.region
+  name                      = local.csi
+  create_dlq                = true
+  sqs_kms_key_arn           = var.kms_key_arn
+  sqs_policy_overload       = data.aws_iam_policy_document.allow_sns_send.json
+  message_retention_seconds = 1209600 # 14 days
+}
+
+data "aws_iam_policy_document" "allow_sns_send" {
+  statement {
+    sid    = "AllowSNSSendMessage"
+    effect = "Allow"
+
+    principals {
+      type        = "Service"
+      identifiers = ["sns.amazonaws.com"]
+    }
+
+    actions = [
+      "sqs:SendMessage",
+    ]
+
+    resources = [
+      module.sqs_queue.sqs_queue_arn,
+    ]
+  }
+}
diff --git a/infrastructure/terraform/modules/eventpub/sns_topic_subscription_lambda.tf b/infrastructure/terraform/modules/eventpub/sns_topic_subscription_lambda.tf
deleted file mode 100644
index ffee18a..0000000
--- a/infrastructure/terraform/modules/eventpub/sns_topic_subscription_lambda.tf
+++ /dev/null
@@ -1,5 +0,0 @@
-resource "aws_sns_topic_subscription" "lambda" {
-  topic_arn = aws_sns_topic.main.arn
-  protocol  = "lambda"
-  endpoint  = aws_lambda_function.main.arn
-}
diff --git a/infrastructure/terraform/modules/eventpub/sns_topic_subscription_sqs.tf b/infrastructure/terraform/modules/eventpub/sns_topic_subscription_sqs.tf
new file mode 100644
index 0000000..46241c8
--- /dev/null
+++ b/infrastructure/terraform/modules/eventpub/sns_topic_subscription_sqs.tf
@@ -0,0 +1,5 @@
+resource "aws_sns_topic_subscription" "sqs" {
+  topic_arn = aws_sns_topic.main.arn
+  protocol  = "sqs"
+  endpoint  = module.sqs_queue.sqs_queue_arn
+}