diff --git a/app/controllers/sign_up/completions_controller.rb b/app/controllers/sign_up/completions_controller.rb
index 6dd5af26a6f..33af693179a 100644
--- a/app/controllers/sign_up/completions_controller.rb
+++ b/app/controllers/sign_up/completions_controller.rb
@@ -81,7 +81,7 @@ def sign_user_out_and_instruct_to_go_back_to_mobile_app
     end
 
     def analytics_attributes(page_occurence)
-      {
+      attributes = {
         ial2: sp_session[:ial2],
         ialmax: sp_session[:ialmax],
         service_provider_name: decorated_sp_session.sp_name,
@@ -91,6 +91,19 @@ def analytics_attributes(page_occurence)
         in_account_creation_flow: user_session[:in_account_creation_flow] || false,
         needs_completion_screen_reason: needs_completion_screen_reason,
       }
+
+      if page_occurence.present? && DisposableDomain.disposable?(email_domain)
+        attributes[:disposable_email_domain] = email_domain
+      end
+
+      attributes
+    end
+
+    def email_domain
+      @email_domain ||= begin
+        email_address = current_user.email_addresses.take.email
+        Mail::Address.new(email_address).domain
+      end
     end
 
     def track_completion_event(last_page)
diff --git a/app/models/disposable_domain.rb b/app/models/disposable_domain.rb
index f32d48d914d..082199f0970 100644
--- a/app/models/disposable_domain.rb
+++ b/app/models/disposable_domain.rb
@@ -1,2 +1,9 @@
 class DisposableDomain < ApplicationRecord
+  class << self
+    def disposable?(domain)
+      return false if !domain.is_a?(String) || domain.empty?
+
+      exists?(name: domain)
+    end
+  end
 end
diff --git a/spec/controllers/sign_up/completions_controller_spec.rb b/spec/controllers/sign_up/completions_controller_spec.rb
index 60095800142..45c93fb7335 100644
--- a/spec/controllers/sign_up/completions_controller_spec.rb
+++ b/spec/controllers/sign_up/completions_controller_spec.rb
@@ -1,6 +1,8 @@
 require 'rails_helper'
 
 RSpec.describe SignUp::CompletionsController do
+  let(:temporary_email) { 'name@temporary.com' }
+
   describe '#show' do
     let(:current_sp) { create(:service_provider) }
 
@@ -22,8 +24,10 @@
       end
 
       context 'IAL1' do
-        let(:user) { create(:user, :fully_registered) }
+        let(:user) { create(:user, :fully_registered, email: temporary_email) }
+
         before do
+          DisposableDomain.create(name: 'temporary.com')
           stub_sign_in(user)
           subject.session[:sp] = {
             issuer: current_sp.issuer,
@@ -255,11 +259,47 @@
         patch :update
         expect(response).to redirect_to account_path
       end
+
+      context 'with a disposable email address' do
+        let(:user) { create(:user, :fully_registered, email: temporary_email) }
+
+        it 'logs disposable domain' do
+          DisposableDomain.create(name: 'temporary.com')
+          stub_sign_in(user)
+          subject.session[:sp] = {
+            ial2: false,
+            issuer: 'foo',
+            request_url: 'http://example.com',
+          }
+          subject.user_session[:in_account_creation_flow] = true
+
+          patch :update
+
+          expect(@analytics).to have_received(:track_event).with(
+            'User registration: complete',
+            ial2: false,
+            ialmax: nil,
+            service_provider_name: subject.decorated_sp_session.sp_name,
+            page_occurence: 'agency-page',
+            needs_completion_screen_reason: :new_sp,
+            sp_request_requested_attributes: nil,
+            sp_session_requested_attributes: nil,
+            in_account_creation_flow: true,
+            disposable_email_domain: 'temporary.com',
+          )
+        end
+      end
     end
 
     context 'IAL2' do
       it 'tracks analytics' do
-        user = create(:user, :fully_registered, profiles: [create(:profile, :verified, :active)])
+        DisposableDomain.create(name: 'temporary.com')
+        user = create(
+          :user,
+          :fully_registered,
+          profiles: [create(:profile, :verified, :active)],
+          email: temporary_email,
+        )
         stub_sign_in(user)
         sp = create(:service_provider, issuer: 'https://awesome')
         subject.session[:sp] = {
@@ -282,6 +322,7 @@
           sp_request_requested_attributes: nil,
           sp_session_requested_attributes: ['email'],
           in_account_creation_flow: true,
+          disposable_email_domain: 'temporary.com',
         )
       end
 
diff --git a/spec/models/disposable_domain_spec.rb b/spec/models/disposable_domain_spec.rb
new file mode 100644
index 00000000000..3572d1b0859
--- /dev/null
+++ b/spec/models/disposable_domain_spec.rb
@@ -0,0 +1,31 @@
+require 'rails_helper'
+
+RSpec.describe DisposableDomain do
+  let(:domain) { 'temporary.com' }
+
+  describe '.disposable?' do
+    before do
+      DisposableDomain.create(name: domain)
+    end
+
+    context 'when the domain exists' do
+      it 'returns true' do
+        expect(DisposableDomain.disposable?(domain)).to eq true
+      end
+    end
+
+    context 'when the domain does not exist' do
+      it 'returns false' do
+        expect(DisposableDomain.disposable?('example.com')).to eq false
+      end
+    end
+
+    context 'with bad data' do
+      it 'returns false' do
+        expect(DisposableDomain.disposable?('')).to eq false
+        expect(DisposableDomain.disposable?(nil)).to eq false
+        expect(DisposableDomain.disposable?({})).to eq false
+      end
+    end
+  end
+end