diff --git a/Gemfile b/Gemfile
index c6e525175..c7b560dd2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -106,6 +106,8 @@ gem 'select2-rails'
 gem 'prawn', '~> 2.0.1'
 gem 'prawn_rails', '~> 0.0.11'
 
+gem 'sentry-raven'
+
 group :test do
   gem 'capybara'
   gem 'launchy'
@@ -148,8 +150,3 @@ group :development, :test do
   # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
   gem 'dotenv-rails'
 end
-
-group :production, :staging do
-  gem 'sentry-raven'
-end
-
diff --git a/app/controllers/backoffice/dossiers_controller.rb b/app/controllers/backoffice/dossiers_controller.rb
index a5477430f..9ab9c4d08 100644
--- a/app/controllers/backoffice/dossiers_controller.rb
+++ b/app/controllers/backoffice/dossiers_controller.rb
@@ -1,4 +1,6 @@
 class Backoffice::DossiersController < Backoffice::DossiersListController
+  include ActionView::Helpers::NumberHelper
+
   respond_to :html, :xlsx, :ods, :csv
 
   prepend_before_action :store_current_location, only: :show
@@ -112,6 +114,8 @@ class Backoffice::DossiersController < Backoffice::DossiersListController
 
     dossier = @facade.dossier
 
+    attestation_pdf = nil
+
     case params[:process_action]
     when "refuse"
       next_step = "refuse"
@@ -125,12 +129,15 @@ class Backoffice::DossiersController < Backoffice::DossiersListController
       next_step = "close"
       notice = "Dossier traité avec succès."
       template = dossier.procedure.closed_mail_template
+      if check_attestation_emailable(dossier)
+        attestation_pdf = dossier.attestation.pdf.read
+      end
     end
 
     dossier.next_step! 'gestionnaire', next_step, motivation
     flash.notice = notice
 
-    NotificationMailer.send_notification(dossier, template).deliver_now!
+    NotificationMailer.send_notification(dossier, template, attestation_pdf).deliver_now!
 
     redirect_to backoffice_dossier_path(id: dossier.id)
   end
@@ -185,6 +192,16 @@ class Backoffice::DossiersController < Backoffice::DossiersListController
 
   private
 
+  def check_attestation_emailable(dossier)
+    if dossier&.attestation&.emailable? == false
+      human_size = number_to_human_size(dossier.attestation.pdf.size)
+      msg = "the attestation of the dossier #{dossier.id} cannot be mailed because it is too heavy: #{human_size}"
+      capture_message(msg, level: 'error')
+    end
+
+    dossier&.attestation&.emailable?
+  end
+
   def store_current_location
     if !gestionnaire_signed_in?
       store_location_for(:gestionnaire, request.url)
diff --git a/app/mailers/notification_mailer.rb b/app/mailers/notification_mailer.rb
index 6c7d4b91c..6c75975df 100644
--- a/app/mailers/notification_mailer.rb
+++ b/app/mailers/notification_mailer.rb
@@ -3,12 +3,16 @@ class NotificationMailer < ApplicationMailer
 
   after_action :create_commentaire_for_notification, only: :send_notification
 
-  def send_notification(dossier, mail_template)
+  def send_notification(dossier, mail_template, attestation = nil)
     vars_mailer(dossier)
 
     @object = mail_template.object_for_dossier dossier
     @body = mail_template.body_for_dossier dossier
 
+    if attestation.present?
+      attachments['attestation.pdf'] = attestation
+    end
+
     mail(subject: @object) { |format| format.html { @body } }
   end
 
diff --git a/app/models/attestation.rb b/app/models/attestation.rb
index 605ed11a4..220e2c364 100644
--- a/app/models/attestation.rb
+++ b/app/models/attestation.rb
@@ -2,4 +2,10 @@ class Attestation < ApplicationRecord
   belongs_to :dossier
 
   mount_uploader :pdf, AttestationUploader
+
+  MAX_SIZE_EMAILABLE = 2.megabytes
+
+  def emailable?
+    pdf.size <= MAX_SIZE_EMAILABLE
+  end
 end
diff --git a/spec/controllers/backoffice/dossiers_controller_spec.rb b/spec/controllers/backoffice/dossiers_controller_spec.rb
index 5d11f4b2d..e019314ba 100644
--- a/spec/controllers/backoffice/dossiers_controller_spec.rb
+++ b/spec/controllers/backoffice/dossiers_controller_spec.rb
@@ -268,7 +268,7 @@ describe Backoffice::DossiersController, type: :controller do
 
       it 'Notification email is sent' do
         expect(NotificationMailer).to receive(:send_notification)
-          .with(dossier, kind_of(Mails::RefusedMail)).and_return(NotificationMailer)
+          .with(dossier, kind_of(Mails::RefusedMail), nil).and_return(NotificationMailer)
         expect(NotificationMailer).to receive(:deliver_now!)
 
         subject
@@ -294,7 +294,7 @@ describe Backoffice::DossiersController, type: :controller do
 
       it 'Notification email is sent' do
         expect(NotificationMailer).to receive(:send_notification)
-          .with(dossier, kind_of(Mails::WithoutContinuationMail)).and_return(NotificationMailer)
+          .with(dossier, kind_of(Mails::WithoutContinuationMail), nil).and_return(NotificationMailer)
         expect(NotificationMailer).to receive(:deliver_now!)
 
         subject
@@ -304,9 +304,17 @@ describe Backoffice::DossiersController, type: :controller do
     end
 
     context "with close" do
+      let(:expected_attestation) { nil }
+
       before do
         dossier.received!
         sign_in gestionnaire
+
+        expect(NotificationMailer).to receive(:send_notification)
+          .with(dossier, kind_of(Mails::ClosedMail), expected_attestation)
+          .and_return(NotificationMailer)
+
+        expect(NotificationMailer).to receive(:deliver_now!)
       end
 
       subject { post :process_dossier, params: { process_action: "close", dossier_id: dossier_id} }
@@ -318,15 +326,42 @@ describe Backoffice::DossiersController, type: :controller do
         expect(dossier.state).to eq('closed')
       end
 
-      it 'Notification email is sent' do
-        expect(NotificationMailer).to receive(:send_notification)
-          .with(dossier, kind_of(Mails::ClosedMail)).and_return(NotificationMailer)
-        expect(NotificationMailer).to receive(:deliver_now!)
-
-        subject
+      context 'when the dossier does not have any attestation' do
+        it 'Notification email is sent' do
+          subject
+        end
       end
 
-      it { is_expected.to redirect_to backoffice_dossier_path(id: dossier.id) }
+      context 'when the dossier has an attestation' do
+        let(:emailable) { false }
+
+        before do
+          fake_attestation = double(pdf: double(read: 'pdf', size: 2.megabytes), emailable?: emailable)
+          allow_any_instance_of(Dossier).to receive(:attestation).and_return(fake_attestation)
+        end
+
+        context 'emailable' do
+          let(:emailable) { true }
+          let(:expected_attestation) { 'pdf' }
+
+          it 'Notification email is sent with the attestation' do
+            subject
+          end
+        end
+
+        context 'when the dossier has an attestation not emailable' do
+          let(:emailable) { false }
+          let(:expected_attestation) { nil }
+
+          it 'Notification email is sent without the attestation' do
+            expect(controller).to receive(:capture_message)
+
+            subject
+          end
+        end
+
+        it { is_expected.to redirect_to backoffice_dossier_path(id: dossier.id) }
+      end
     end
   end
 
diff --git a/spec/mailers/notification_mailer_spec.rb b/spec/mailers/notification_mailer_spec.rb
index e9a66e4a7..9fcfba7bf 100644
--- a/spec/mailers/notification_mailer_spec.rb
+++ b/spec/mailers/notification_mailer_spec.rb
@@ -5,11 +5,25 @@ RSpec.describe NotificationMailer, type: :mailer do
     let(:user) { create(:user) }
     let(:dossier) { create(:dossier, user: user) }
     let(:email) { instance_double('email', object_for_dossier: 'object', body_for_dossier: 'body') }
-    let (:notifications_count_before) { Notification.count }
-    subject { described_class.send_notification(dossier, email) }
+    let(:attestation) { nil }
+    let(:notifications_count_before) { Notification.count }
+
+    subject { described_class.send_notification(dossier, email, attestation) }
 
     it { expect(subject.subject).to eq(email.object_for_dossier) }
     it { expect(subject.body).to eq(email.body_for_dossier) }
+    it { expect(subject.attachments['attestation.pdf']).to eq(nil) }
+
+    context 'when an attestation is provided' do
+      let(:attestation) { 'attestation' }
+
+      it do
+        expect(subject.attachments['attestation.pdf'].content_type)
+          .to eq('application/pdf; filename=attestation.pdf')
+
+        expect(subject.attachments['attestation.pdf'].body).to eq('attestation')
+      end
+    end
 
     it "creates a commentaire, which is not notified" do
       described_class.send_notification(dossier, email).deliver_now
diff --git a/spec/models/attestation_spec.rb b/spec/models/attestation_spec.rb
new file mode 100644
index 000000000..5bf9e89f5
--- /dev/null
+++ b/spec/models/attestation_spec.rb
@@ -0,0 +1,23 @@
+RSpec.describe Attestation, type: :model do
+  describe 'emailable' do
+    let(:attestation) do
+      attestation = Attestation.new
+      expect(attestation).to receive(:pdf).and_return(double(size: size))
+      attestation
+    end
+
+    subject { attestation.emailable? }
+
+    context 'when the pdf size is acceptable' do
+      let(:size) { Attestation::MAX_SIZE_EMAILABLE }
+
+      it { is_expected.to be true }
+    end
+
+    context 'when the pdf size is unacceptable' do
+      let(:size) { Attestation::MAX_SIZE_EMAILABLE + 1 }
+
+      it { is_expected.to be false }
+    end
+  end
+end