diff --git a/app/services/expired_users_deletion_service.rb b/app/services/expired_users_deletion_service.rb
index ca0eb5d37..417baa851 100644
--- a/app/services/expired_users_deletion_service.rb
+++ b/app/services/expired_users_deletion_service.rb
@@ -1,7 +1,22 @@
 class ExpiredUsersDeletionService
+  RETENTION_AFTER_NOTICE = 2.weeks
+
   def self.process_expired
-    users = find_expired_user
-    users.find_each do |user|
+    delete_expired_users
+    send_inactive_close_to_expiration_notice
+  end
+
+  def self.send_inactive_close_to_expiration_notice
+    expiring_users_to_notify.in_batches do |batch|
+      batch.each do |user|
+        UserMailer.notify_inactive_close_to_deletion(user).perform_later
+      end
+      batch.update_all(inactive_close_to_expiration_notice_sent_at: Time.zone.now.utc)
+    end
+  end
+
+  def self.delete_expired_users
+    expiring_user_notified.find_each do |user|
       user.delete_and_keep_track_dossiers_also_delete_user(nil)
     end
   end
@@ -14,4 +29,12 @@ class ExpiredUsersDeletionService
       .group('users.id')
   end
   # rubocop:enable DS/Unscoped
+
+  def self.expiring_users_to_notify
+    expiring_users.where(inactive_close_to_expiration_notice_sent_at: nil)
+  end
+
+  def self.expiring_user_notified
+    expiring_users.where.not(inactive_close_to_expiration_notice_sent_at: RETENTION_AFTER_NOTICE.ago..)
+  end
 end
diff --git a/spec/services/expired_users_deletion_service_spec.rb b/spec/services/expired_users_deletion_service_spec.rb
index 73d86178f..85e1ce2a4 100644
--- a/spec/services/expired_users_deletion_service_spec.rb
+++ b/spec/services/expired_users_deletion_service_spec.rb
@@ -3,26 +3,49 @@ describe ExpiredUsersDeletionService do
   before { user && dossier }
 
   describe '#process_expired' do
-    subject { ExpiredUsersDeletionService.process_expired }
-    context 'when user has a dossier created 1 year ago' do
-      let(:dossier) { create(:dossier, user:, created_at: 1.year.ago) }
-      it 'does not destroy anything' do
-        expect { subject }.not_to change { Dossier.count }
-        expect(user.reload).to be_truthy
+    context 'when user has not been notified' do
+      subject { ExpiredUsersDeletionService.process_expired }
+
+      context 'when user has a dossier created 3 years ago' do
+        let(:dossier) { create(:dossier, user:, created_at: 3.years.ago) }
+        it 'update user.inactive_close_to_expiration_notice_sent_at ' do
+          expect(UserMailer).to receive(:notify_inactive_close_to_deletion).with(user).and_return(double(perform_later: true))
+          expect { subject }
+            .to change { user.reload.inactive_close_to_expiration_notice_sent_at }
+            .from(nil).to(anything)
+        end
       end
     end
 
-    context 'when user has a dossier created 3 years ago' do
-      let(:dossier) { create(:dossier, user:, created_at: 3.years.ago) }
-      it 'destroys user and dossier' do
-        expect { subject }.to change { Dossier.count }.by(-1)
-        expect { user.reload }.to raise_error(ActiveRecord::RecordNotFound)
+    context 'when user has been notified 1 week ago' do
+      before { user.update(inactive_close_to_expiration_notice_sent_at: 1.week.ago) }
+      subject { ExpiredUsersDeletionService.process_expired }
+
+      context 'when user has a dossier created 3 years ago' do
+        let(:dossier) { create(:dossier, user:, created_at: 3.years.ago) }
+        it 'do nothing' do
+          expect { subject }.not_to change { Dossier.count }
+          expect { user.reload }.not_to raise_error(ActiveRecord::RecordNotFound)
+        end
+      end
+    end
+
+    context 'when user has been notified 3 weeks ago' do
+      before { user.update(inactive_close_to_expiration_notice_sent_at: 3.weeks.ago) }
+      subject { ExpiredUsersDeletionService.process_expired }
+
+      context 'when user has a dossier created 3 years ago' do
+        let(:dossier) { create(:dossier, user:, created_at: 3.years.ago) }
+        it 'destroys user and dossier' do
+          expect { subject }.to change { Dossier.count }.by(-1)
+          expect { user.reload }.to raise_error(ActiveRecord::RecordNotFound)
+        end
       end
     end
   end
 
-  describe '#find_expired_user' do
-    subject { ExpiredUsersDeletionService.find_expired_user }
+  describe '#expiring_users' do
+    subject { ExpiredUsersDeletionService.expiring_users }
 
     context 'when user has no dossiers (TODO: just drop all user without dossier, no need to alert them)' do
       let(:dossier) { nil }