diff --git a/src/app/modules/bounce/__tests__/bounce.controller.spec.ts b/src/app/modules/bounce/__tests__/bounce.controller.spec.ts
index e835515e2c..7fa6bda211 100644
--- a/src/app/modules/bounce/__tests__/bounce.controller.spec.ts
+++ b/src/app/modules/bounce/__tests__/bounce.controller.spec.ts
@@ -172,6 +172,7 @@ describe('handleSns', () => {
     expect(MockBounceService.getEditorsWithContactNumbers).toHaveBeenCalledWith(
       mockForm,
     )
+    expect(mockBounceDoc.hasNotified).toHaveBeenCalled()
     expect(MockBounceService.sendEmailBounceNotification).toHaveBeenCalledWith(
       mockBounceDoc,
       mockForm,
@@ -229,6 +230,7 @@ describe('handleSns', () => {
     expect(MockBounceService.getEditorsWithContactNumbers).toHaveBeenCalledWith(
       mockForm,
     )
+    expect(mockBounceDoc.hasNotified).toHaveBeenCalled()
     expect(MockBounceService.sendEmailBounceNotification).toHaveBeenCalledWith(
       mockBounceDoc,
       mockForm,
@@ -257,6 +259,54 @@ describe('handleSns', () => {
     expect(MOCK_RES.sendStatus).toHaveBeenCalledWith(200)
   })
 
+  it('should call services correctly when recipients have already been notified of a critical bounce', async () => {
+    mockBounceDoc.hasNotified.mockReturnValue(true)
+
+    await handleSns(MOCK_REQ, MOCK_RES, jest.fn())
+
+    expect(MockBounceService.validateSnsRequest).toHaveBeenCalledWith(
+      MOCK_REQ.body,
+    )
+    expect(MockBounceService.logEmailNotification).toHaveBeenCalledWith(
+      MOCK_NOTIFICATION,
+    )
+    expect(MockBounceService.extractEmailType).toHaveBeenCalledWith(
+      MOCK_NOTIFICATION,
+    )
+    expect(MockBounceService.getUpdatedBounceDoc).toHaveBeenCalledWith(
+      MOCK_NOTIFICATION,
+    )
+    expect(MockFormService.retrieveFullFormById).toHaveBeenCalledWith(
+      mockBounceDoc.formId,
+    )
+    expect(mockBounceDoc.isCriticalBounce).toHaveBeenCalled()
+    expect(MockBounceService.getEditorsWithContactNumbers).toHaveBeenCalledWith(
+      mockForm,
+    )
+    expect(mockBounceDoc.hasNotified).toHaveBeenCalled()
+    // Notification functions are not called
+    expect(MockBounceService.sendEmailBounceNotification).not.toHaveBeenCalled()
+    expect(MockBounceService.sendSmsBounceNotification).not.toHaveBeenCalled()
+    expect(mockBounceDoc.setNotificationState).not.toHaveBeenCalled()
+    expect(mockBounceDoc.areAllPermanentBounces).toHaveBeenCalled()
+    expect(MockFormService.deactivateForm).toHaveBeenCalledWith(
+      mockBounceDoc.formId,
+    )
+    expect(MockBounceService.notifyAdminsOfDeactivation).toHaveBeenCalledWith(
+      mockForm,
+      MOCK_CONTACTS,
+    )
+    expect(MockBounceService.logCriticalBounce).toHaveBeenCalledWith({
+      bounceDoc: mockBounceDoc,
+      notification: MOCK_NOTIFICATION,
+      autoEmailRecipients: [],
+      autoSmsRecipients: [],
+      hasDeactivated: true,
+    })
+    expect(MockBounceService.saveBounceDoc).toHaveBeenCalledWith(mockBounceDoc)
+    expect(MOCK_RES.sendStatus).toHaveBeenCalledWith(200)
+  })
+
   it('should return 200 even when errors are thrown in getUpdatedBounceDoc', async () => {
     MockBounceService.getUpdatedBounceDoc.mockReturnValueOnce(
       errAsync(new DatabaseError()),
@@ -334,6 +384,7 @@ describe('handleSns', () => {
     expect(MockBounceService.getEditorsWithContactNumbers).toHaveBeenCalledWith(
       mockForm,
     )
+    expect(mockBounceDoc.hasNotified).toHaveBeenCalled()
     expect(mockBounceDoc.areAllPermanentBounces).toHaveBeenCalled()
     expect(MockFormService.deactivateForm).toHaveBeenCalledWith(
       mockBounceDoc.formId,
@@ -367,6 +418,7 @@ describe('handleSns', () => {
     expect(MockBounceService.getEditorsWithContactNumbers).toHaveBeenCalledWith(
       mockForm,
     )
+    expect(mockBounceDoc.hasNotified).toHaveBeenCalled()
     expect(mockBounceDoc.areAllPermanentBounces).toHaveBeenCalled()
     expect(MockFormService.deactivateForm).toHaveBeenCalledWith(
       mockBounceDoc.formId,
diff --git a/src/app/modules/bounce/bounce.controller.ts b/src/app/modules/bounce/bounce.controller.ts
index 404cd59568..3de863e75d 100644
--- a/src/app/modules/bounce/bounce.controller.ts
+++ b/src/app/modules/bounce/bounce.controller.ts
@@ -8,6 +8,7 @@ import { ControllerHandler } from '../core/core.types'
 import * as FormService from '../form/form.service'
 
 import * as BounceService from './bounce.service'
+import { AdminNotificationRecipients } from './bounce.types'
 
 const logger = createLoggerWithLabel(module)
 
@@ -78,16 +79,29 @@ export const handleSns: ControllerHandler<
     // Send notifications and deactivate form on best-effort basis, ignore errors
     const possibleSmsRecipients =
       await BounceService.getEditorsWithContactNumbers(form).unwrapOr([])
-    const emailRecipients = await BounceService.sendEmailBounceNotification(
-      bounceDoc,
-      form,
-    ).unwrapOr([])
-    const smsRecipients = await BounceService.sendSmsBounceNotification(
-      bounceDoc,
-      form,
-      possibleSmsRecipients,
-    ).unwrapOr([])
-    bounceDoc.setNotificationState(emailRecipients, smsRecipients)
+
+    const notificationRecipients: AdminNotificationRecipients = {
+      emailRecipients: [],
+      smsRecipients: [],
+    }
+    // Check if notifications have been sent to form admins and collaborators
+    if (!bounceDoc.hasNotified()) {
+      notificationRecipients.emailRecipients =
+        await BounceService.sendEmailBounceNotification(
+          bounceDoc,
+          form,
+        ).unwrapOr([])
+      notificationRecipients.smsRecipients =
+        await BounceService.sendSmsBounceNotification(
+          bounceDoc,
+          form,
+          possibleSmsRecipients,
+        ).unwrapOr([])
+      bounceDoc.setNotificationState(
+        notificationRecipients.emailRecipients,
+        notificationRecipients.smsRecipients,
+      )
+    }
 
     const shouldDeactivate = bounceDoc.areAllPermanentBounces()
     if (shouldDeactivate) {
@@ -102,8 +116,8 @@ export const handleSns: ControllerHandler<
     BounceService.logCriticalBounce({
       bounceDoc,
       notification,
-      autoEmailRecipients: emailRecipients,
-      autoSmsRecipients: smsRecipients,
+      autoEmailRecipients: notificationRecipients.emailRecipients,
+      autoSmsRecipients: notificationRecipients.smsRecipients,
       hasDeactivated: shouldDeactivate,
     })
   }
diff --git a/src/app/modules/bounce/bounce.types.ts b/src/app/modules/bounce/bounce.types.ts
new file mode 100644
index 0000000000..bacec4ab51
--- /dev/null
+++ b/src/app/modules/bounce/bounce.types.ts
@@ -0,0 +1,6 @@
+import { UserWithContactNumber } from '../user/user.types'
+
+export interface AdminNotificationRecipients {
+  emailRecipients: string[]
+  smsRecipients: UserWithContactNumber[]
+}