diff --git a/app/jobs/priorized_mail_delivery_job.rb b/app/jobs/priorized_mail_delivery_job.rb
index 2404e3912..bf0ea10b7 100644
--- a/app/jobs/priorized_mail_delivery_job.rb
+++ b/app/jobs/priorized_mail_delivery_job.rb
@@ -13,6 +13,6 @@ class PriorizedMailDeliveryJob < ActionMailer::MailDeliveryJob
   end
 
   def custom_queue
-    'low'
+    'default'
   end
 end
diff --git a/spec/mailers/administrateur_mailer_spec.rb b/spec/mailers/administrateur_mailer_spec.rb
index 180877eb1..6cba576f0 100644
--- a/spec/mailers/administrateur_mailer_spec.rb
+++ b/spec/mailers/administrateur_mailer_spec.rb
@@ -11,8 +11,8 @@ RSpec.describe AdministrateurMailer, type: :mailer do
     it { expect(subject.subject).to include("La suppression automatique des dossiers a été activée sur la démarche") }
 
     context 'when perform_later is called' do
-      let(:custom_queue) { 'low' }
-      it 'enqueues email is custom queue for low priority delivery' do
+      let(:custom_queue) { 'default' }
+      it 'enqueues email is custom queue for non critical delivery' do
         expect { subject.deliver_later }.to have_enqueued_job.on_queue(custom_queue)
       end
     end
@@ -51,8 +51,8 @@ end
     it { expect(subject.body).to include("un de vos services n'a pas son siret renseigné") }
 
     context 'when perform_later is called' do
-      let(:custom_queue) { 'low' }
-      it 'enqueues email is custom queue for low priority delivery' do
+      let(:custom_queue) { 'default' }
+      it 'enqueues email is custom queue for non critical delivery' do
         expect { subject.deliver_later }.to have_enqueued_job.on_queue(custom_queue)
       end
     end
diff --git a/spec/mailers/instructeur_mailer_spec.rb b/spec/mailers/instructeur_mailer_spec.rb
index 28667228e..ede31bfae 100644
--- a/spec/mailers/instructeur_mailer_spec.rb
+++ b/spec/mailers/instructeur_mailer_spec.rb
@@ -10,9 +10,9 @@ RSpec.describe InstructeurMailer, type: :mailer do
     it { expect(subject.body).to include('Bonjour') }
 
     context 'when perform_later is called' do
-      let(:custom_queue) { 'low' }
+      let(:custom_queue) { 'default' }
 
-      it 'enqueues email is custom queue for low priority delivery' do
+      it 'enqueues email is custom queue for non critical delivery' do
         expect { subject.deliver_later }.to have_enqueued_job(PriorizedMailDeliveryJob).on_queue(custom_queue)
       end
     end
@@ -80,8 +80,8 @@ RSpec.describe InstructeurMailer, type: :mailer do
     end
 
     context 'when perform_later is called' do
-      let(:custom_queue) { 'low' }
-      it 'enqueues email is custom queue for low priority delivery' do
+      let(:custom_queue) { 'default' }
+      it 'enqueues email is custom queue for non critical delivery' do
         expect { subject.deliver_later }.to have_enqueued_job.on_queue(custom_queue)
       end
     end
diff --git a/spec/mailers/user_mailer_spec.rb b/spec/mailers/user_mailer_spec.rb
index aa2b1812a..3ef0c4fce 100644
--- a/spec/mailers/user_mailer_spec.rb
+++ b/spec/mailers/user_mailer_spec.rb
@@ -151,8 +151,8 @@ RSpec.describe UserMailer, type: :mailer do
 
     context 'when perform_later is called' do
       let(:role) { administrateurs(:default_admin) }
-      let(:custom_queue) { 'low' }
-      it 'enqueues email is custom queue for low priority delivery' do
+      let(:custom_queue) { 'default' }
+      it 'enqueues email is custom queue for non critical delivery' do
         expect { subject.deliver_later }.to have_enqueued_job.on_queue(custom_queue)
       end
     end
@@ -167,8 +167,8 @@ RSpec.describe UserMailer, type: :mailer do
     end
 
     context 'when perform_later is called' do
-      let(:custom_queue) { 'low' }
-      it 'enqueues email is custom queue for low priority delivery' do
+      let(:custom_queue) { 'default' }
+      it 'enqueues email is custom queue for non critical delivery' do
         expect { subject.deliver_later }.to have_enqueued_job.on_queue(custom_queue)
       end
     end
@@ -181,13 +181,13 @@ RSpec.describe UserMailer, type: :mailer do
 
     it 'notifies user about procedure closing with detailed message' do
       expect(subject.to).to eq([user.email])
-      expect(subject.body).to include("Clôture d&#39;une démarche sur demarches-simplifiees.fr")
+      expect(subject.body).to include("Clôture d&#39;une démarche sur #{APPLICATION_NAME}")
       expect(subject.body).to include("Bonjour,\r\n<br />saut de ligne")
     end
 
     context 'when perform_later is called' do
-      let(:custom_queue) { 'low' }
-      it 'enqueues email is custom queue for low priority delivery' do
+      let(:custom_queue) { 'default' }
+      it 'enqueues email is custom queue for non critical delivery' do
         expect { subject.deliver_later }.to have_enqueued_job.on_queue(custom_queue)
       end
     end