diff --git a/app/assets/stylesheets/new_design/dossier_messagerie.scss b/app/assets/stylesheets/new_design/dossier_messagerie.scss
index 28e1aa9ac..6bf4aae51 100644
--- a/app/assets/stylesheets/new_design/dossier_messagerie.scss
+++ b/app/assets/stylesheets/new_design/dossier_messagerie.scss
@@ -15,9 +15,13 @@
     font-weight: bold;
   }
 
+  .guest,
   .date {
     font-size: 12px;
     color: $grey;
+  }
+
+  .date {
     float: right;
   }
 }
diff --git a/app/views/new_gestionnaire/dossiers/messagerie.html.haml b/app/views/new_gestionnaire/dossiers/messagerie.html.haml
index 56f59ad73..65bfc1477 100644
--- a/app/views/new_gestionnaire/dossiers/messagerie.html.haml
+++ b/app/views/new_gestionnaire/dossiers/messagerie.html.haml
@@ -7,5 +7,7 @@
         %h2
           %span.mail
             = render partial: 'commentaire_issuer', locals: { commentaire: commentaire, current_gestionnaire: current_gestionnaire }
+          - if ![current_gestionnaire.email, @dossier.user.email, 'contact@tps.apientreprise.fr'].include?(commentaire.email)
+            %span.guest  Invité
           %span.date= I18n.l(commentaire.created_at.localtime, format: '%d/%m/%y')
         %p= sanitize(commentaire.body)