diff --git a/app/mailers/concerns/mailer_defaults_configurable_concern.rb b/app/mailers/concerns/mailer_defaults_configurable_concern.rb
index 0bf67ba86..de256157f 100644
--- a/app/mailers/concerns/mailer_defaults_configurable_concern.rb
+++ b/app/mailers/concerns/mailer_defaults_configurable_concern.rb
@@ -57,7 +57,7 @@ module MailerDefaultsConfigurableConcern
 
     def set_currents_for_demarches_gouv_fr
       Current.application_name = "demarches.gouv.fr"
-      Current.host = ENV.fetch("APP_HOST")
+      Current.host = "demarches.gouv.fr"
       Current.contact_email = "contact@demarches.gouv.fr"
       Current.no_reply_email = NO_REPLY_EMAIL.sub("demarches-simplifiees.fr", "demarches.gouv.fr") # rubocop:disable DS/ApplicationName
     end
diff --git a/spec/mailers/devise_user_mailer_spec.rb b/spec/mailers/devise_user_mailer_spec.rb
index 1b6160c6b..ed0e946ff 100644
--- a/spec/mailers/devise_user_mailer_spec.rb
+++ b/spec/mailers/devise_user_mailer_spec.rb
@@ -57,8 +57,8 @@ RSpec.describe DeviseUserMailer, type: :mailer do
         it "respect preferred domain" do
           expect(header_value("From", subject.message)).to eq("Ne pas répondre <ne-pas-repondre@demarches.gouv.fr>")
           expect(header_value("Reply-To", subject.message)).to eq("Ne pas répondre <ne-pas-repondre@demarches.gouv.fr>")
-          expect(subject.message.to_s).to include("#{ENV.fetch("APP_HOST")}/users/confirmation")
-          expect(subject.message.to_s).to include("//#{ENV.fetch("APP_HOST")}/assets/mailer/republique")
+          expect(subject.message.to_s).to include("demarches.gouv.fr/users/confirmation")
+          expect(subject.message.to_s).to include("//demarches.gouv.fr/assets/mailer/republique")
         end
       end
     end
@@ -78,7 +78,7 @@ RSpec.describe DeviseUserMailer, type: :mailer do
 
         it "respect preferred domain" do
           expect(header_value("From", subject.message)).to include("@demarches.gouv.fr")
-          expect(subject.message.to_s).to include("#{ENV.fetch("APP_HOST")}/users/password")
+          expect(subject.message.to_s).to include("demarches.gouv.fr/users/password")
         end
       end
     end
diff --git a/spec/mailers/dossier_mailer_spec.rb b/spec/mailers/dossier_mailer_spec.rb
index c018b7df1..e142ddb40 100644
--- a/spec/mailers/dossier_mailer_spec.rb
+++ b/spec/mailers/dossier_mailer_spec.rb
@@ -32,7 +32,7 @@ RSpec.describe DossierMailer, type: :mailer do
       let(:user) { create(:user, preferred_domain: :demarches_gouv_fr) }
 
       it 'includes the correct body content and sender email' do
-        expect(subject.body).to include(dossier_url(dossier, host: ENV.fetch('APP_HOST')))
+        expect(subject.body).to include(dossier_url(dossier, host: 'demarches.gouv.fr'))
         expect(header_value("From", subject)).to include("ne-pas-repondre@demarches.gouv.fr")
       end
     end
@@ -333,7 +333,7 @@ RSpec.describe DossierMailer, type: :mailer do
     context 'when recipient has preferred domain' do
       let(:dossier_transfer) { create(:dossier_transfer, email: create(:user, preferred_domain: :demarches_gouv_fr).email) }
       it 'includes a link with the preferred domain in the email body' do
-        expect(subject.body).to include(dossiers_url(statut: "dossiers-transferes", host: ENV.fetch("APP_HOST")))
+        expect(subject.body).to include(dossiers_url(statut: "dossiers-transferes", host: 'demarches.gouv.fr'))
       end
     end
 
diff --git a/spec/mailers/notification_mailer_spec.rb b/spec/mailers/notification_mailer_spec.rb
index 74308afb5..e6222596a 100644
--- a/spec/mailers/notification_mailer_spec.rb
+++ b/spec/mailers/notification_mailer_spec.rb
@@ -112,7 +112,7 @@ RSpec.describe NotificationMailer, type: :mailer do
         let(:user) { create(:user, preferred_domain: :demarches_gouv_fr) }
 
         it 'adjusts links and sender email for user preferred domain' do
-          expect(mail.body).to have_link(href: dossier_url(dossier, host: ENV.fetch("APP_HOST")))
+          expect(mail.body).to have_link(href: dossier_url(dossier, host: 'demarches.gouv.fr'))
           expect(header_value("From", mail)).to include("@demarches.gouv.fr")
         end
       end
diff --git a/spec/mailers/user_mailer_spec.rb b/spec/mailers/user_mailer_spec.rb
index 47ad40331..7b6ef9641 100644
--- a/spec/mailers/user_mailer_spec.rb
+++ b/spec/mailers/user_mailer_spec.rb
@@ -21,7 +21,7 @@ RSpec.describe UserMailer, type: :mailer do
         let(:user) { create(:user, preferred_domain: :demarches_gouv_fr) }
 
         it do
-          expect(subject.body).to have_link("Commencer la démarche « #{procedure.libelle} »", href: commencer_sign_in_url(path: procedure.path, host: ENV.fetch("APP_HOST")))
+          expect(subject.body).to have_link("Commencer la démarche « #{procedure.libelle} »", href: commencer_sign_in_url(path: procedure.path, host: "demarches.gouv.fr"))
           expect(header_value("From", subject)).to include("@demarches.gouv.fr")
         end
       end