diff --git a/app/controllers/users/dossiers_controller.rb b/app/controllers/users/dossiers_controller.rb
index e6a64f2cd..592f16f2c 100644
--- a/app/controllers/users/dossiers_controller.rb
+++ b/app/controllers/users/dossiers_controller.rb
@@ -149,6 +149,8 @@ module Users
       @no_description = true
 
       if @dossier.update(dossier_params) && @dossier.individual.valid?
+        # TODO: remove this after proper mandat email validation
+        @dossier.individual.update!(email_verified_at: Time.zone.now)
         @dossier.update!(autorisation_donnees: true, identity_updated_at: Time.zone.now)
         flash.notice = t('.identity_saved')
 
diff --git a/app/models/user.rb b/app/models/user.rb
index 3a9aebfb2..d047ab1d1 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -63,6 +63,7 @@ class User < ApplicationRecord
 
   # Callback provided by Devise
   def after_confirmation
+    update!(email_verified_at: Time.zone.now)
     link_invites!
   end
 
@@ -98,7 +99,7 @@ class User < ApplicationRecord
 
   def self.create_or_promote_to_instructeur(email, password, administrateurs: [])
     user = User
-      .create_with(password: password, confirmed_at: Time.zone.now)
+      .create_with(password: password, confirmed_at: Time.zone.now, email_verified_at: Time.zone.now)
       .find_or_create_by(email: email)
 
     if user.valid?
@@ -137,7 +138,7 @@ class User < ApplicationRecord
 
   def self.create_or_promote_to_expert(email, password)
     user = User
-      .create_with(password: password, confirmed_at: Time.zone.now)
+      .create_with(password: password, confirmed_at: Time.zone.now, email_verified_at: Time.zone.now)
       .find_or_create_by(email: email)
 
     if user.valid?
diff --git a/app/tasks/maintenance/prefill_individual_email_verified_at_task.rb b/app/tasks/maintenance/prefill_individual_email_verified_at_task.rb
new file mode 100644
index 000000000..fa6e045d2
--- /dev/null
+++ b/app/tasks/maintenance/prefill_individual_email_verified_at_task.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+# We are going to confirm the various email addresses of the users in the system.
+# Individual model (mandant) needs their email_verified_at attribute to be set in order to receive emails.
+# This task sets the email_verified_at attribute to the current time for all the individual to be backward compatible
+# See https://github.com/demarches-simplifiees/demarches-simplifiees.fr/issues/10450
+module Maintenance
+  class PrefillIndividualEmailVerifiedAtTask < MaintenanceTasks::Task
+    def collection
+      Individual.in_batches
+    end
+
+    def process(batch_of_individuals)
+      batch_of_individuals.update_all(email_verified_at: Time.zone.now)
+    end
+  end
+end
diff --git a/app/tasks/maintenance/prefill_user_email_verified_at_task.rb b/app/tasks/maintenance/prefill_user_email_verified_at_task.rb
new file mode 100644
index 000000000..ad3ba6f5b
--- /dev/null
+++ b/app/tasks/maintenance/prefill_user_email_verified_at_task.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+# We are going to confirm the various email addresses of the users in the system.
+# User model needs their email_verified_at attribute to be set in order to receive emails.
+# This task sets the email_verified_at attribute to the current time for all users to be backward compatible
+# See https://github.com/demarches-simplifiees/demarches-simplifiees.fr/issues/10450
+module Maintenance
+  class PrefillUserEmailVerifiedAtTask < MaintenanceTasks::Task
+    def collection
+      User.in_batches
+    end
+
+    def process(batch_of_users)
+      batch_of_users.update_all(email_verified_at: Time.zone.now)
+    end
+  end
+end
diff --git a/db/migrate/20240524120336_add_email_verified_at_column_to_users.rb b/db/migrate/20240524120336_add_email_verified_at_column_to_users.rb
new file mode 100644
index 000000000..176b9d2ab
--- /dev/null
+++ b/db/migrate/20240524120336_add_email_verified_at_column_to_users.rb
@@ -0,0 +1,5 @@
+class AddEmailVerifiedAtColumnToUsers < ActiveRecord::Migration[7.0]
+  def change
+    add_column :users, :email_verified_at, :datetime
+  end
+end
diff --git a/db/migrate/20240527090508_add_email_verified_at_column_to_individuals.rb b/db/migrate/20240527090508_add_email_verified_at_column_to_individuals.rb
new file mode 100644
index 000000000..b77aea273
--- /dev/null
+++ b/db/migrate/20240527090508_add_email_verified_at_column_to_individuals.rb
@@ -0,0 +1,5 @@
+class AddEmailVerifiedAtColumnToIndividuals < ActiveRecord::Migration[7.0]
+  def change
+    add_column :individuals, :email_verified_at, :datetime
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 22ee0febd..74b41f6c7 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2024_04_17_053843) do
+ActiveRecord::Schema[7.0].define(version: 2024_05_27_090508) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_buffercache"
   enable_extension "pg_stat_statements"
@@ -752,6 +752,7 @@ ActiveRecord::Schema[7.0].define(version: 2024_04_17_053843) do
     t.datetime "created_at", precision: nil
     t.integer "dossier_id"
     t.string "email"
+    t.datetime "email_verified_at"
     t.string "gender"
     t.string "nom"
     t.string "notification_method"
@@ -1137,6 +1138,7 @@ ActiveRecord::Schema[7.0].define(version: 2024_04_17_053843) do
     t.datetime "current_sign_in_at", precision: nil
     t.string "current_sign_in_ip"
     t.string "email", default: "", null: false
+    t.datetime "email_verified_at"
     t.string "encrypted_password", default: "", null: false
     t.integer "failed_attempts", default: 0, null: false
     t.datetime "inactive_close_to_expiration_notice_sent_at"
diff --git a/db/seeds.rb b/db/seeds.rb
index 52f97d02f..1a021ad23 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -13,7 +13,8 @@ SuperAdmin.create!(email: default_user, password: default_password)
 user = User.create!(
   email: default_user,
   password: default_password,
-  confirmed_at: Time.zone.now
+  confirmed_at: Time.zone.now,
+  email_verified_at: Time.zone.now
 )
 user.create_instructeur!
 user.create_administrateur!
diff --git a/spec/controllers/users/dossiers_controller_spec.rb b/spec/controllers/users/dossiers_controller_spec.rb
index 8dd165c01..8d3b702f9 100644
--- a/spec/controllers/users/dossiers_controller_spec.rb
+++ b/spec/controllers/users/dossiers_controller_spec.rb
@@ -211,6 +211,7 @@ describe Users::DossiersController, type: :controller do
         expect(individual.errors.full_messages).to be_empty
         expect(individual.notification_method).to eq('email')
         expect(individual.email).to eq('mickey@gmail.com')
+        expect(individual.email_verified_at).to be_present
         expect(response).to redirect_to(brouillon_dossier_path(dossier))
       end
 
diff --git a/spec/models/france_connect_information_spec.rb b/spec/models/france_connect_information_spec.rb
index 621c729b3..1dcb149cc 100644
--- a/spec/models/france_connect_information_spec.rb
+++ b/spec/models/france_connect_information_spec.rb
@@ -19,6 +19,7 @@ describe FranceConnectInformation, type: :model do
       it do
         subject
         expect(fci.user.email).to eq('a@email.com')
+        expect(fci.user.email_verified_at).to be_present
       end
     end
   end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 336d78886..409507d37 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -16,6 +16,12 @@ describe User, type: :model do
       user.confirm
       expect(user.reload.invites.size).to eq(2)
     end
+
+    it 'verifies its email' do
+      expect(user.email_verified_at).to be_nil
+      user.confirm
+      expect(user.email_verified_at).to be_present
+    end
   end
 
   describe '#owns?' do
@@ -111,6 +117,7 @@ describe User, type: :model do
         user = subject
         expect(user.valid_password?(password)).to be true
         expect(user.confirmed_at).to be_present
+        expect(user.email_verified_at).to be_present
         expect(user.instructeur).to be_present
       end
 
@@ -184,6 +191,7 @@ describe User, type: :model do
         user = subject
         expect(user.valid_password?(password)).to be true
         expect(user.confirmed_at).to be_present
+        expect(user.email_verified_at).to be_present
         expect(user.expert).to be_present
       end
     end
@@ -214,6 +222,18 @@ describe User, type: :model do
     end
   end
 
+  describe '.create_or_promote_to_gestionnaire' do
+    let(:email) { 'inst1@gmail.com' }
+    let(:password) { 'un super password !' }
+
+    subject { User.create_or_promote_to_gestionnaire(email, password) }
+
+    it 'verifies its email' do
+      user = subject
+      expect(user.email_verified_at).to be_present
+    end
+  end
+
   describe 'invite_administrateur!' do
     let(:super_admin) { create(:super_admin) }
     let(:administrateur) { create(:administrateur) }