diff --git a/app/jobs/administrateurs/activate_before_expiration_job.rb b/app/jobs/administrateurs/activate_before_expiration_job.rb
new file mode 100644
index 000000000..d8fd8c27a
--- /dev/null
+++ b/app/jobs/administrateurs/activate_before_expiration_job.rb
@@ -0,0 +1,9 @@
+class Administrateurs::ActivateBeforeExpirationJob < ApplicationJob
+  queue_as :cron
+
+  def perform(*args)
+    Administrateur.inactive.where(created_at: 2.days.ago.all_day).each do |a|
+      AdministrateurMailer.activate_before_expiration(a).deliver_later
+    end
+  end
+end
diff --git a/app/mailers/administrateur_mailer.rb b/app/mailers/administrateur_mailer.rb
new file mode 100644
index 000000000..351206064
--- /dev/null
+++ b/app/mailers/administrateur_mailer.rb
@@ -0,0 +1,11 @@
+class AdministrateurMailer < ApplicationMailer
+  layout 'mailers/layout'
+
+  def activate_before_expiration(administrateur)
+    @administrateur = administrateur
+    @expiration_date = administrateur.reset_password_sent_at + Devise.reset_password_within
+    mail(to: administrateur.email,
+         subject: "demarches-simplifiees.fr - N'oubliez pas d'activer votre compte administrateur",
+         reply_to: "contact@demarches-simplifiees.fr")
+  end
+end
diff --git a/app/views/administrateur_mailer/activate_before_expiration.haml b/app/views/administrateur_mailer/activate_before_expiration.haml
new file mode 100644
index 000000000..0fa678348
--- /dev/null
+++ b/app/views/administrateur_mailer/activate_before_expiration.haml
@@ -0,0 +1,17 @@
+- content_for(:title, "N'oubliez pas d'activer votre compte")
+
+Bonjour,
+%br
+%br
+Vous avez fait la demande d’un compte administrateur sur demarches-simplifiees.fr.
+Votre compte a été créé mais reste inactif, il arrivera à expiration le #{@expiration_date.strftime("%d/%m/%Y")}
+%br
+%br
+Afin d’activer votre compte, veuillez cliquer sur le lien ci-dessous :
+= link_to(admin_activate_url(token: @administrateur.reset_password_token), admin_activate_url(token: @administrateur.reset_password_token))
+%br
+%br
+Nous restons à votre disposition si vous avez besoin d’accompagnement.
+%br
+%br
+= render partial: "layouts/mailers/bizdev_signature"
diff --git a/spec/jobs/administrateurs/activate_before_expiration_job_spec.rb b/spec/jobs/administrateurs/activate_before_expiration_job_spec.rb
new file mode 100644
index 000000000..1a92e38bf
--- /dev/null
+++ b/spec/jobs/administrateurs/activate_before_expiration_job_spec.rb
@@ -0,0 +1,72 @@
+require 'rails_helper'
+
+RSpec.describe Administrateurs::ActivateBeforeExpirationJob, type: :job do
+  describe 'perform' do
+    let(:administrateur) { create(:administrateur, active: active) }
+    let(:mailer_double) { double('mailer', deliver_later: true) }
+
+    subject { Administrateurs::ActivateBeforeExpirationJob.perform_now }
+
+    before do
+      Timecop.freeze(DateTime.new(2018, 03, 20))
+      administrateur.reload
+      allow(AdministrateurMailer).to receive(:activate_before_expiration).and_return(mailer_double)
+    end
+
+    after { Timecop.return }
+
+    context "with an inactive administrateur" do
+      let(:active) { false }
+
+      context "created now" do
+        before { subject }
+        it { expect(AdministrateurMailer).not_to have_received(:activate_before_expiration) }
+      end
+
+      context "created a long time ago" do
+        before do
+          administrateur.update_columns(created_at: DateTime.new(2018, 03, 10))
+          subject
+        end
+
+        it { expect(AdministrateurMailer).not_to have_received(:activate_before_expiration) }
+      end
+
+      context "created 2 days ago" do
+        before do
+          administrateur.update_columns(created_at: DateTime.new(2018, 03, 18, 20, 00))
+          subject
+        end
+
+        it { expect(AdministrateurMailer).to have_received(:activate_before_expiration).with(administrateur) }
+      end
+    end
+
+    context "with an active administrateur" do
+      let(:active) { true }
+
+      context "created now" do
+        before { subject }
+        it { expect(AdministrateurMailer).not_to have_received(:activate_before_expiration) }
+      end
+
+      context "created a long time ago" do
+        before do
+          administrateur.update_columns(created_at: DateTime.new(2018, 03, 10))
+          subject
+        end
+
+        it { expect(AdministrateurMailer).not_to have_received(:activate_before_expiration) }
+      end
+
+      context "created 2 days ago" do
+        before do
+          administrateur.update_columns(created_at: DateTime.new(2018, 03, 18, 20, 00))
+          subject
+        end
+
+        it { expect(AdministrateurMailer).not_to have_received(:activate_before_expiration) }
+      end
+    end
+  end
+end
diff --git a/spec/mailers/previews/administrateur_mailer_preview.rb b/spec/mailers/previews/administrateur_mailer_preview.rb
new file mode 100644
index 000000000..67e6a54b9
--- /dev/null
+++ b/spec/mailers/previews/administrateur_mailer_preview.rb
@@ -0,0 +1,5 @@
+class AdministrateurMailerPreview < ActionMailer::Preview
+  def activate_before_expiration
+    AdministrateurMailer.activate_before_expiration(Administrateur.inactive.where.not(reset_password_token: nil).last)
+  end
+end