diff --git a/app/assets/stylesheets/new_design/new_footer.scss b/app/assets/stylesheets/new_design/new_footer.scss
index 502875b70..b17ff187d 100644
--- a/app/assets/stylesheets/new_design/new_footer.scss
+++ b/app/assets/stylesheets/new_design/new_footer.scss
@@ -15,7 +15,7 @@ footer {
 }
 
 .dossier-footer {
-  @include vertical-padding(48px);
+  @include vertical-padding(30px);
   line-height: 24px;
 }
 
@@ -32,11 +32,10 @@ footer {
   flex-grow: 1;
   min-width: 280px;
   margin: 0 20px;
-  margin-bottom: 20px;
+  margin-bottom: 30px;
 
-  @media (max-width: 1000px) {
+  @media (max-width: 550px) {
     width: 100%;
-    margin-bottom: 14px;
   }
 }
 
@@ -98,8 +97,23 @@ footer {
 }
 
 .footer-bottom-line {
-  margin-top: 30px;
-  margin-bottom: -30px;
   text-align: center;
   font-size: small;
+
+  @media (max-width: 550px) {
+    text-align: left;
+  }
+}
+
+.footer-row {
+  margin-bottom: 30px;
+
+  &:last-child {
+    margin-bottom: 0;
+  }
+
+  // In this case, the bottom margin is defined directly on each individual column
+  &.footer-columns {
+    margin-bottom: 0;
+  }
 }
diff --git a/app/assets/stylesheets/new_design/personnes_impliquees.scss b/app/assets/stylesheets/new_design/personnes_impliquees.scss
index 80c227495..ac908f538 100644
--- a/app/assets/stylesheets/new_design/personnes_impliquees.scss
+++ b/app/assets/stylesheets/new_design/personnes_impliquees.scss
@@ -5,4 +5,10 @@
     list-style-type: disc;
     margin-left: 16px;
   }
+
+  // scss-lint:disable SelectorFormat
+  .form .select2-container .select2-selection__rendered {
+    padding: 12px;
+  }
+  // scss-lint:enable
 }
diff --git a/app/controllers/new_gestionnaire/dossiers_controller.rb b/app/controllers/new_gestionnaire/dossiers_controller.rb
index b23359872..76950e5a4 100644
--- a/app/controllers/new_gestionnaire/dossiers_controller.rb
+++ b/app/controllers/new_gestionnaire/dossiers_controller.rb
@@ -37,9 +37,13 @@ module NewGestionnaire
       @potential_recipients = procedure.gestionnaires.reject { |g| g == current_gestionnaire }
     end
 
-    def envoyer_a_instructeur
-      recipient = Gestionnaire.find(params[:recipient])
-      GestionnaireMailer.send_dossier(current_gestionnaire, dossier, recipient).deliver_later
+    def send_to_instructeurs
+      recipients = Gestionnaire.find(params[:recipients])
+
+      recipients.each do |recipient|
+        GestionnaireMailer.send_dossier(current_gestionnaire, dossier, recipient).deliver_later
+      end
+
       flash.notice = "Dossier envoyé"
       redirect_to(personnes_impliquees_gestionnaire_dossier_path(procedure, dossier))
     end
diff --git a/app/javascript/new_design/select2.js b/app/javascript/new_design/select2.js
index 78d1f9023..ccd14b117 100644
--- a/app/javascript/new_design/select2.js
+++ b/app/javascript/new_design/select2.js
@@ -7,10 +7,17 @@ addEventListener('turbolinks:load', () => {
     width: '100%'
   });
 
-  $('select.select2-limited').select2({
+  $('.columns-form select.select2-limited').select2({
     language: 'fr',
     placeholder: 'Sélectionnez des colonnes',
     maximumSelectionLength: '5',
     width: '300px'
   });
+
+  $('.recipients-form select.select2-limited').select2({
+    language: 'fr',
+    placeholder: 'Sélectionnez des instructeurs',
+    maximumSelectionLength: '30',
+    width: '300px'
+  });
 });
diff --git a/app/views/new_gestionnaire/avis/messagerie.html.haml b/app/views/new_gestionnaire/avis/messagerie.html.haml
index 9bea14b67..0847cb19d 100644
--- a/app/views/new_gestionnaire/avis/messagerie.html.haml
+++ b/app/views/new_gestionnaire/avis/messagerie.html.haml
@@ -2,4 +2,4 @@
 
 = render partial: 'header', locals: { avis: @avis, dossier: @dossier }
 
-= render partial: "shared/dossiers/messagerie", locals: { dossier: @dossier, user_email: current_gestionnaire.email, messagerie_seen_at: nil, new_commentaire: @commentaire, form_url: commentaire_gestionnaire_avis_path(@avis) }
+= render partial: "shared/dossiers/messagerie", locals: { dossier: @dossier, connected_user: current_gestionnaire, messagerie_seen_at: nil, new_commentaire: @commentaire, form_url: commentaire_gestionnaire_avis_path(@avis) }
diff --git a/app/views/new_gestionnaire/dossiers/_envoyer_dossier_block.html.haml b/app/views/new_gestionnaire/dossiers/_envoyer_dossier_block.html.haml
index 0fead70e5..20fccfb17 100644
--- a/app/views/new_gestionnaire/dossiers/_envoyer_dossier_block.html.haml
+++ b/app/views/new_gestionnaire/dossiers/_envoyer_dossier_block.html.haml
@@ -4,7 +4,11 @@
   %p.tab-paragraph
     Vous êtes le seul instructeur assigné sur cette démarche
 - else
-  = form_for dossier, url: envoyer_a_instructeur_gestionnaire_dossier_path(dossier.procedure, dossier), method: :post, html: { class: 'form' } do |f|
-    .flex.justify-start.align-baseline
-      = select_tag(:recipient, options_from_collection_for_select(potential_recipients, :id, :email))
+  = form_for dossier, url: send_to_instructeurs_gestionnaire_dossier_path(dossier.procedure, dossier), method: :post, html: { class: 'form recipients-form' } do |f|
+    .flex.justify-start.align-start
+      = select_tag(:recipients,
+        options_from_collection_for_select(potential_recipients, :id, :email),
+        multiple: true,
+        class: 'select2-limited',
+        placeholder: '')
       = f.submit "Envoyer", class: "button large send gap-left"
diff --git a/app/views/new_gestionnaire/dossiers/messagerie.html.haml b/app/views/new_gestionnaire/dossiers/messagerie.html.haml
index e62eeae7f..096d37588 100644
--- a/app/views/new_gestionnaire/dossiers/messagerie.html.haml
+++ b/app/views/new_gestionnaire/dossiers/messagerie.html.haml
@@ -2,4 +2,4 @@
 
 = render partial: "header", locals: { dossier: @dossier }
 
-= render partial: "shared/dossiers/messagerie", locals: { dossier: @dossier, user_email: current_gestionnaire.email, messagerie_seen_at: @messagerie_seen_at , new_commentaire: @commentaire, form_url: commentaire_gestionnaire_dossier_path(@dossier.procedure, @dossier) }
+= render partial: "shared/dossiers/messagerie", locals: { dossier: @dossier, connected_user: current_gestionnaire, messagerie_seen_at: @messagerie_seen_at , new_commentaire: @commentaire, form_url: commentaire_gestionnaire_dossier_path(@dossier.procedure, @dossier) }
diff --git a/app/views/new_gestionnaire/dossiers/print.html.haml b/app/views/new_gestionnaire/dossiers/print.html.haml
index dbffd5ec5..9bcb22e0d 100644
--- a/app/views/new_gestionnaire/dossiers/print.html.haml
+++ b/app/views/new_gestionnaire/dossiers/print.html.haml
@@ -84,7 +84,7 @@
   %ul.messages-list
     - @dossier.commentaires.each do |commentaire|
       %li
-        = render partial: "shared/dossiers/messages/message", locals: { commentaire: commentaire, user_email: current_gestionnaire.email, messagerie_seen_at: nil }
+        = render partial: "shared/dossiers/messages/message", locals: { commentaire: commentaire, connected_user: current_gestionnaire, messagerie_seen_at: nil }
 
 %script{ type: "text/javascript" }
   window.print();
diff --git a/app/views/new_gestionnaire/procedures/show.html.haml b/app/views/new_gestionnaire/procedures/show.html.haml
index ce6b9e971..2626e3cdb 100644
--- a/app/views/new_gestionnaire/procedures/show.html.haml
+++ b/app/views/new_gestionnaire/procedures/show.html.haml
@@ -81,7 +81,7 @@
               %span.button.dropdown
                 Personnaliser
                 .dropdown-content.fade-in-down
-                  = form_tag update_displayed_fields_gestionnaire_procedure_path(@procedure), method: :patch, class: 'dropdown-form' do
+                  = form_tag update_displayed_fields_gestionnaire_procedure_path(@procedure), method: :patch, class: 'dropdown-form columns-form' do
                     = select_tag :values,
                       options_for_select(@procedure.fields_for_select,
                         selected: @displayed_fields_values),
diff --git a/app/views/new_user/dossiers/_footer.html.haml b/app/views/new_user/dossiers/_footer.html.haml
index bf760ac11..95c0aa129 100644
--- a/app/views/new_user/dossiers/_footer.html.haml
+++ b/app/views/new_user/dossiers/_footer.html.haml
@@ -1,9 +1,8 @@
 %footer.dossier-footer
   .container
-    %ul.footer-columns
-
-      - service = dossier.procedure.service
-      - if service.present?
+    - service = dossier.procedure.service
+    - if service.present?
+      %ul.footer-row.footer-columns
         %li.footer-column
           %h3.footer-header Cette démarche est gérée par :
           %p
@@ -29,14 +28,14 @@
           %p
             Horaires : #{ service.horaires.sub(/\S/, &:downcase) }
 
-      - politiques = politiques_conservation_de_donnees(dossier.procedure)
-      - if politiques.present?
-        %li.footer-column
-          %h3.footer-header Conservation des données :
-          - politiques.each do |politique|
-            %p= politique
+        - politiques = politiques_conservation_de_donnees(dossier.procedure)
+        - if politiques.present?
+          %li.footer-column
+            %h3.footer-header Conservation des données :
+            - politiques.each do |politique|
+              %p= politique
 
-    .footer-bottom-line
+    .footer-row.footer-bottom-line
       = link_to "Accessibilité", accessibilite_index_path, :class => "footer-link"
       –
       = link_to "CGU", CGU_URL, :class => "footer-link", :target => "_blank", rel: "noopener noreferrer"
diff --git a/app/views/new_user/dossiers/messagerie.html.haml b/app/views/new_user/dossiers/messagerie.html.haml
index 964b2f663..7715042cb 100644
--- a/app/views/new_user/dossiers/messagerie.html.haml
+++ b/app/views/new_user/dossiers/messagerie.html.haml
@@ -7,4 +7,4 @@
     %p.messagerie-explanation
       La messagerie vous permet de contacter l’instructeur en charge de votre dossier.
 
-  = render partial: "shared/dossiers/messagerie", locals: { dossier: @dossier, user_email: current_user.email, messagerie_seen_at: nil, new_commentaire: @commentaire, form_url: commentaire_dossier_path(@dossier) }
+  = render partial: "shared/dossiers/messagerie", locals: { dossier: @dossier, connected_user: current_user, messagerie_seen_at: nil, new_commentaire: @commentaire, form_url: commentaire_dossier_path(@dossier) }
diff --git a/app/views/shared/dossiers/_messagerie.html.haml b/app/views/shared/dossiers/_messagerie.html.haml
index ee380ee09..c67d4a174 100644
--- a/app/views/shared/dossiers/_messagerie.html.haml
+++ b/app/views/shared/dossiers/_messagerie.html.haml
@@ -1,7 +1,7 @@
 .messagerie.container
   %ul.messages-list
     - dossier.commentaires.each do |commentaire|
-      %li.message{ class: commentaire_is_from_me_class(commentaire, user_email) }
-        = render partial: "shared/dossiers/messages/message", locals: { commentaire: commentaire, user_email: user_email, messagerie_seen_at: messagerie_seen_at }
+      %li.message{ class: commentaire_is_from_me_class(commentaire, connected_user.email) }
+        = render partial: "shared/dossiers/messages/message", locals: { commentaire: commentaire, connected_user: connected_user, messagerie_seen_at: messagerie_seen_at }
 
   = render partial: "shared/dossiers/messages/form", locals: { commentaire: new_commentaire, form_url: form_url }
diff --git a/app/views/shared/dossiers/messages/_message.html.haml b/app/views/shared/dossiers/messages/_message.html.haml
index b49e88abb..a1b78bc9d 100644
--- a/app/views/shared/dossiers/messages/_message.html.haml
+++ b/app/views/shared/dossiers/messages/_message.html.haml
@@ -1,9 +1,9 @@
-= render partial: 'shared/dossiers/messages/message_icon', locals: { commentaire: commentaire, user_email: user_email }
+= render partial: 'shared/dossiers/messages/message_icon', locals: { commentaire: commentaire, connected_user: connected_user }
 
 .width-100
   %h2
     %span.mail
-      = render partial: 'shared/dossiers/messages/message_issuer', locals: { commentaire: commentaire, user_email: user_email }
+      = render partial: 'shared/dossiers/messages/message_issuer', locals: { commentaire: commentaire, connected_user: connected_user }
     - if commentaire_is_from_guest(commentaire)
       %span.guest Invité
     %span.date{ class: highlight_if_unseen_class(messagerie_seen_at, commentaire.created_at) }
diff --git a/app/views/shared/dossiers/messages/_message_icon.html.haml b/app/views/shared/dossiers/messages/_message_icon.html.haml
index bfa5d2581..cca3f3568 100644
--- a/app/views/shared/dossiers/messages/_message_icon.html.haml
+++ b/app/views/shared/dossiers/messages/_message_icon.html.haml
@@ -1,5 +1,5 @@
 - case commentaire.email
-- when user_email
+- when connected_user.email
   = image_tag('icons/account-circle.svg', class: 'person-icon')
 - when OLD_CONTACT_EMAIL
 - when CONTACT_EMAIL
diff --git a/app/views/shared/dossiers/messages/_message_issuer.html.haml b/app/views/shared/dossiers/messages/_message_issuer.html.haml
index dc4f7bce0..23cb7dbfc 100644
--- a/app/views/shared/dossiers/messages/_message_issuer.html.haml
+++ b/app/views/shared/dossiers/messages/_message_issuer.html.haml
@@ -1,5 +1,5 @@
 - case commentaire.email
-- when user_email
+- when connected_user.email
   Vous
 - when OLD_CONTACT_EMAIL
 - when CONTACT_EMAIL
diff --git a/config/routes.rb b/config/routes.rb
index 78a27debe..19adc8ed6 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -322,7 +322,7 @@ Rails.application.routes.draw do
             post 'passer-en-instruction' => 'dossiers#passer_en_instruction'
             post 'repasser-en-construction' => 'dossiers#repasser_en_construction'
             post 'terminer'
-            post 'envoyer-a-instructeur' => 'dossiers#envoyer_a_instructeur'
+            post 'send-to-instructeurs' => 'dossiers#send_to_instructeurs'
             scope :carte do
               get 'position'
             end
diff --git a/spec/controllers/new_gestionnaire/dossiers_controller_spec.rb b/spec/controllers/new_gestionnaire/dossiers_controller_spec.rb
index 570a63cb9..65a0e2255 100644
--- a/spec/controllers/new_gestionnaire/dossiers_controller_spec.rb
+++ b/spec/controllers/new_gestionnaire/dossiers_controller_spec.rb
@@ -31,7 +31,7 @@ describe NewGestionnaire::DossiersController, type: :controller do
     end
   end
 
-  describe '#envoyer_a_instructeur' do
+  describe '#send_to_instructeurs' do
     let(:recipient) { create(:gestionnaire) }
     let(:gestionnaires) { [gestionnaire, recipient] }
     let(:mail) { double("mail") }
@@ -45,9 +45,9 @@ describe NewGestionnaire::DossiersController, type: :controller do
         .and_return(mail)
 
       post(
-        :envoyer_a_instructeur,
+        :send_to_instructeurs,
         params: {
-          recipient: recipient,
+          recipients: [recipient],
           procedure_id: procedure.id,
           dossier_id: dossier.id
         }
diff --git a/spec/features/new_gestionnaire/gestionnaire_spec.rb b/spec/features/new_gestionnaire/gestionnaire_spec.rb
index 24c5375ca..94826ca91 100644
--- a/spec/features/new_gestionnaire/gestionnaire_spec.rb
+++ b/spec/features/new_gestionnaire/gestionnaire_spec.rb
@@ -134,6 +134,32 @@ feature 'The gestionnaire part' do
     expect(page).to have_text(gestionnaire2.email)
   end
 
+  scenario 'A gestionnaire can send a dossier to several instructeurs', js: true do
+    instructeur_2 = FactoryBot.create(:gestionnaire)
+    instructeur_3 = FactoryBot.create(:gestionnaire)
+    procedure.gestionnaires << [instructeur_2, instructeur_3]
+
+    send_dossier = double()
+    expect(GestionnaireMailer).to receive(:send_dossier).and_return(send_dossier).twice
+    expect(send_dossier).to receive(:deliver_later).twice
+
+    log_in(gestionnaire.email, password)
+
+    click_on procedure.libelle
+    click_on dossier.user.email
+
+    click_on 'Personnes impliquées'
+
+    first('.select2-container', minimum: 1).click
+    find('li.select2-results__option[role="treeitem"]', text: instructeur_2.email).click
+    first('.select2-container', minimum: 1).click
+    find('li.select2-results__option[role="treeitem"]', text: instructeur_3.email).click
+
+    click_on 'Envoyer'
+
+    expect(page).to have_text("Dossier envoyé")
+  end
+
   def log_in(email, password)
     visit '/'
     click_on 'Connexion'
diff --git a/spec/views/shared/dossiers/messages/message.html.haml_spec.rb b/spec/views/shared/dossiers/messages/message.html.haml_spec.rb
index c33ff269b..585e3507c 100644
--- a/spec/views/shared/dossiers/messages/message.html.haml_spec.rb
+++ b/spec/views/shared/dossiers/messages/message.html.haml_spec.rb
@@ -1,7 +1,7 @@
 describe 'shared/dossiers/messages/message.html.haml', type: :view do
   before { view.extend DossierHelper }
 
-  subject { render 'shared/dossiers/messages/message.html.haml', commentaire: commentaire, messagerie_seen_at: seen_at, user_email: dossier.user.email }
+  subject { render 'shared/dossiers/messages/message.html.haml', commentaire: commentaire, messagerie_seen_at: seen_at, connected_user: dossier.user }
 
   let(:dossier) { create(:dossier) }
   let(:commentaire) { create(:commentaire, dossier: dossier) }