diff --git a/itou/templates/apply/includes/job_application_sender_info.html b/itou/templates/apply/includes/job_application_sender_info.html
index 4b0e570cbbd..52f6fbe5cbc 100644
--- a/itou/templates/apply/includes/job_application_sender_info.html
+++ b/itou/templates/apply/includes/job_application_sender_info.html
@@ -1,6 +1,21 @@
 {% load format_filters %}
 {% load matomo %}
 
+{% if job_application_sender_left_org %}
+    <div class="alert alert-warning alert-dismissible fade show" role="status">
+        <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Fermer"></button>
+        <div class="row">
+            <div class="col-auto pe-0">
+                <i class="ri-information-line ri-xl text-warning" aria-hidden="true"></i>
+            </div>
+            <div class="col">
+                <p class="mb-0">L’émetteur de cette candidature ne fait plus partie de l’organisation émettrice</p>
+            </div>
+        </div>
+    </div>
+
+
+{% endif %}
 <ul class="list-data list-data__two-column-md mb-3">
     <li>
         <small>Émetteur</small>
@@ -14,6 +29,8 @@
         <small>Adresse e-mail</small>
         {% if request.user.is_job_seeker and job_application.sender_kind != SenderKind.JOB_SEEKER %}
             <strong>Non communiquée</strong>
+        {% elif job_application_sender_left_org %}
+            <div class="text-warning fst-italic">Les réponses seront transmises aux administrateurs de l’organisation</div>
         {% else %}
             <strong>{{ job_application.sender.email }}</strong>
             {% matomo_event "candidature" "clic" "copied_sender_email" as matomo_event_attrs %}
diff --git a/itou/www/apply/views/process_views.py b/itou/www/apply/views/process_views.py
index 4ca12919231..f753ec584de 100644
--- a/itou/www/apply/views/process_views.py
+++ b/itou/www/apply/views/process_views.py
@@ -81,6 +81,18 @@ def _get_geiq_eligibility_diagnosis(job_application, only_prescriber):
     ).first()
 
 
+def job_application_sender_left_org(job_app):
+    if job_app.sender_prescriber_organization_id:
+        return not (
+            job_app.sender.prescribermembership_set.active()
+            .filter(organization_id=job_app.sender_prescriber_organization_id)
+            .exists()
+        )
+    if job_app.sender_company_id:
+        return not job_app.sender.companymembership_set.active().filter(company_id=job_app.sender_company_id).exists()
+    return False
+
+
 @login_required
 def details_for_jobseeker(request, job_application_id, template_name="apply/process_details.html"):
     """
@@ -137,6 +149,7 @@ def details_for_jobseeker(request, job_application_id, template_name="apply/proc
         "transition_logs": transition_logs,
         "back_url": back_url,
         "matomo_custom_title": "Candidature",
+        "job_application_sender_left_org": job_application_sender_left_org(job_application),
     }
 
     return render(request, template_name, context)
@@ -250,6 +263,7 @@ def details_for_company(request, job_application_id, template_name="apply/proces
             PriorActionForm(action_only=True) if job_application.can_change_prior_actions else None
         ),
         "matomo_custom_title": "Candidature",
+        "job_application_sender_left_org": job_application_sender_left_org(job_application),
     }
 
     return render(request, template_name, context)
@@ -335,6 +349,7 @@ def details_for_prescriber(request, job_application_id, template_name="apply/pro
         "refused_by": refused_by,
         "refusal_contact_email": refusal_contact_email,
         "with_job_seeker_detail_url": True,
+        "job_application_sender_left_org": job_application_sender_left_org(job_application),
     }
 
     return render(request, template_name, context)
diff --git a/tests/www/apply/__snapshots__/test_process.ambr b/tests/www/apply/__snapshots__/test_process.ambr
index 137b03f9250..fad52611458 100644
--- a/tests/www/apply/__snapshots__/test_process.ambr
+++ b/tests/www/apply/__snapshots__/test_process.ambr
@@ -945,7 +945,7 @@
 # ---
 # name: TestProcessViews.test_details_for_company_from_approval[job application detail for company]
   dict({
-    'num_queries': 18,
+    'num_queries': 19,
     'queries': list([
       dict({
         'origin': list([
@@ -1734,6 +1734,22 @@
           LIMIT 1
         ''',
       }),
+      dict({
+        'origin': list([
+          'job_application_sender_left_org[www/apply/views/process_views.py]',
+          'details_for_company[www/apply/views/process_views.py]',
+        ]),
+        'sql': '''
+          SELECT %s AS "a"
+          FROM "prescribers_prescribermembership"
+          INNER JOIN "users_user" ON ("prescribers_prescribermembership"."user_id" = "users_user"."id")
+          WHERE ("prescribers_prescribermembership"."user_id" = %s
+                 AND "users_user"."is_active"
+                 AND "prescribers_prescribermembership"."is_active"
+                 AND "prescribers_prescribermembership"."organization_id" = %s)
+          LIMIT 1
+        ''',
+      }),
       dict({
         'origin': list([
           'Company.has_admin[common_apps/organizations/models.py]',
@@ -1925,7 +1941,7 @@
 # ---
 # name: TestProcessViews.test_details_for_company_from_list[job application detail for company]
   dict({
-    'num_queries': 18,
+    'num_queries': 19,
     'queries': list([
       dict({
         'origin': list([
@@ -2714,6 +2730,22 @@
           LIMIT 1
         ''',
       }),
+      dict({
+        'origin': list([
+          'job_application_sender_left_org[www/apply/views/process_views.py]',
+          'details_for_company[www/apply/views/process_views.py]',
+        ]),
+        'sql': '''
+          SELECT %s AS "a"
+          FROM "prescribers_prescribermembership"
+          INNER JOIN "users_user" ON ("prescribers_prescribermembership"."user_id" = "users_user"."id")
+          WHERE ("prescribers_prescribermembership"."user_id" = %s
+                 AND "users_user"."is_active"
+                 AND "prescribers_prescribermembership"."is_active"
+                 AND "prescribers_prescribermembership"."organization_id" = %s)
+          LIMIT 1
+        ''',
+      }),
       dict({
         'origin': list([
           'Company.has_admin[common_apps/organizations/models.py]',
diff --git a/tests/www/apply/test_process.py b/tests/www/apply/test_process.py
index 33bee0dbb53..53e2139b31f 100644
--- a/tests/www/apply/test_process.py
+++ b/tests/www/apply/test_process.py
@@ -46,6 +46,7 @@
 from itou.utils.urls import add_url_params
 from itou.utils.widgets import DuetDatePickerWidget
 from itou.www.apply.forms import AcceptForm
+from itou.www.apply.views.process_views import job_application_sender_left_org
 from tests.approvals.factories import (
     ProlongationFactory,
     ProlongationRequestFactory,
@@ -63,7 +64,7 @@
     PriorActionFactory,
 )
 from tests.jobs.factories import create_test_romes_and_appellations
-from tests.prescribers.factories import PrescriberOrganizationFactory
+from tests.prescribers.factories import PrescriberMembershipFactory, PrescriberOrganizationFactory
 from tests.siae_evaluations.factories import EvaluatedSiaeFactory
 from tests.users.factories import EmployerFactory, JobSeekerFactory, LaborInspectorFactory, PrescriberFactory
 from tests.utils.htmx.test import assertSoupEqual, update_page_with_htmx
@@ -79,6 +80,8 @@
     "Si les détails apportés dans le message de réponse ne vous ont pas permis d’en savoir plus,"
     " vous pouvez contacter l’employeur."
 )
+SENDER_LEFT_ORG = "Les réponses seront transmises aux administrateurs de l’organisation"
+SENDER_LEFT_ORG_ALERT = "L’émetteur de cette candidature ne fait plus partie de l’organisation émettrice"
 
 IAE_CANCELLATION_CONFIRMATION = (
     "En validant, <strong>vous renoncez aux aides au poste</strong> liées à cette candidature "
@@ -259,6 +262,20 @@ def test_details_for_company_from_list(self, client, snapshot):
         assertContains(response, resume_link)
         assertNotContains(response, PRIOR_ACTION_SECTION_TITLE)
 
+    def test_details_when_sender_left_org(self, client):
+        job_application = JobApplicationFactory(sent_by_authorized_prescriber_organisation=True)
+        company = job_application.to_company
+        employer = company.members.first()
+        sender = job_application.sender
+        sender.prescribermembership_set.update(is_active=False)
+        client.force_login(employer)
+
+        url = reverse("apply:details_for_company", kwargs={"job_application_id": job_application.pk})
+        response = client.get(url)
+        assertNotContains(response, sender.email)
+        assertContains(response, SENDER_LEFT_ORG)
+        assertContains(response, SENDER_LEFT_ORG_ALERT)
+
     def test_details_archived(self, client):
         UNARCHIVE = "Désarchiver"
         job_application = JobApplicationFactory(
@@ -403,6 +420,19 @@ def test_details_for_prescriber(self, client):
         response = client.get(url)
         assertContains(response, LackOfNIRReason.NIR_ASSOCIATED_TO_OTHER.label, html=True)
 
+    def test_details_for_prescriber_when_sender_left_org(self, client):
+        job_application = JobApplicationFactory(sent_by_authorized_prescriber_organisation=True)
+        prescriber = PrescriberMembershipFactory(organization=job_application.sender_prescriber_organization).user
+        sender = job_application.sender
+        sender.prescribermembership_set.update(is_active=False)
+        client.force_login(prescriber)
+
+        url = reverse("apply:details_for_prescriber", kwargs={"job_application_id": job_application.pk})
+        response = client.get(url)
+        assertNotContains(response, sender.email)
+        assertContains(response, SENDER_LEFT_ORG)
+        assertContains(response, SENDER_LEFT_ORG_ALERT)
+
     def test_details_for_prescriber_as_company_when_i_am_not_the_sender(self, client):
         job_application = JobApplicationFactory(sent_by_authorized_prescriber_organisation=True)
         employer = job_application.to_company.members.first()
@@ -481,6 +511,19 @@ def test_details_for_job_seeker(self, client, snapshot):
 
         assertNotContains(response, PRIOR_ACTION_SECTION_TITLE)
 
+    def test_details_for_job_seeker_when_sender_left_org(self, client):
+        job_application = JobApplicationFactory(sent_by_authorized_prescriber_organisation=True)
+        sender = job_application.sender
+        sender.prescribermembership_set.update(is_active=False)
+
+        client.force_login(job_application.job_seeker)
+
+        url = reverse("apply:details_for_jobseeker", kwargs={"job_application_id": job_application.pk})
+        response = client.get(url)
+        assertNotContains(response, sender.email)
+        assertNotContains(response, SENDER_LEFT_ORG)  # A job seeker never sees the email of the sender
+        assertContains(response, SENDER_LEFT_ORG_ALERT)
+
     def test_details_for_job_seeker_as_other_user(self, client, subtests):
         job_application = JobApplicationFactory()
         url = reverse("apply:details_for_jobseeker", kwargs={"job_application_id": job_application.pk})
@@ -3919,3 +3962,57 @@ def test_approval_status_includes(client, snapshot):
         response,
         "Date de fin prévisionnelle : 29/05/2025",
     )
+
+
+class TestJobApplicationSenderLeftOrg:
+    def test_sender_left_org_prescriber(self):
+        prescriber_membership = PrescriberMembershipFactory()
+        job_app = JobApplicationFactory(
+            sender=prescriber_membership.user, sender_prescriber_organization=prescriber_membership.organization
+        )
+        assert job_application_sender_left_org(job_app) is False
+
+        # membership is inactive
+        prescriber_membership.is_active = False
+        prescriber_membership.save(update_fields=["is_active"])
+        assert job_application_sender_left_org(job_app) is True
+
+        # prescriber is inactive
+        prescriber_membership.is_active = True
+        prescriber_membership.save(update_fields=["is_active"])
+        prescriber_membership.user.is_active = False
+        prescriber_membership.user.save(update_fields=["is_active"])
+        assert job_application_sender_left_org(job_app) is True
+
+        # membership was removed
+        prescriber_membership.user.is_active = True
+        prescriber_membership.user.save(update_fields=["is_active"])
+        prescriber_membership.delete()
+        assert job_application_sender_left_org(job_app) is True
+
+    def test_sender_left_org_employer(self):
+        company_membership = CompanyMembershipFactory()
+        job_app = JobApplicationFactory(sender=company_membership.user, sender_company=company_membership.company)
+        assert job_application_sender_left_org(job_app) is False
+
+        # membership is inactive
+        company_membership.is_active = False
+        company_membership.save(update_fields=["is_active"])
+        assert job_application_sender_left_org(job_app) is True
+
+        # prescriber is inactive
+        company_membership.is_active = True
+        company_membership.save(update_fields=["is_active"])
+        company_membership.user.is_active = False
+        company_membership.user.save(update_fields=["is_active"])
+        assert job_application_sender_left_org(job_app) is True
+
+        # membership was removed
+        company_membership.user.is_active = True
+        company_membership.user.save(update_fields=["is_active"])
+        company_membership.delete()
+        assert job_application_sender_left_org(job_app) is True
+
+    def test_sender_left_org_job_seeker(self):
+        job_app = JobApplicationSentByJobSeekerFactory()
+        assert job_application_sender_left_org(job_app) is False