diff --git a/app/controllers/send_submission_email_controller.rb b/app/controllers/send_submission_email_controller.rb
index 06481b1a..6d1f34c3 100644
--- a/app/controllers/send_submission_email_controller.rb
+++ b/app/controllers/send_submission_email_controller.rb
@@ -10,16 +10,17 @@ class SendSubmissionEmailController < ApplicationController
   SEND_DURATION = 30.minutes
 
   def create
-    @submitter =
-      if params[:template_slug]
-        Submitter.joins(submission: :template).find_by!(email: params[:email].to_s.downcase,
-                                                        template: { slug: params[:template_slug] })
-      elsif params[:submission_slug]
-        Submitter.joins(:submission).find_by!(email: params[:email].to_s.downcase,
-                                              submission: { slug: params[:submission_slug] })
-      else
-        Submitter.find_by!(slug: params[:submitter_slug])
-      end
+    if params[:template_slug]
+      @submitter = Submitter.joins(submission: :template).find_by!(email: params[:email].to_s.downcase,
+                                                                   template: { slug: params[:template_slug] })
+    elsif params[:submission_slug]
+      @submitter = Submitter.joins(:submission).find_by(email: params[:email].to_s.downcase,
+                                                        submission: { slug: params[:submission_slug] })
+
+      return redirect_to submissions_preview_completed_path(params[:submission_slug], status: :error) unless @submitter
+    else
+      @submitter = Submitter.find_by!(slug: params[:submitter_slug])
+    end
 
     RateLimit.call("send-email-#{@submitter.id}", limit: 2, ttl: 5.minutes)
 
diff --git a/app/controllers/submissions_preview_controller.rb b/app/controllers/submissions_preview_controller.rb
index 7986e799..d8a36f0b 100644
--- a/app/controllers/submissions_preview_controller.rb
+++ b/app/controllers/submissions_preview_controller.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 class SubmissionsPreviewController < ApplicationController
+  around_action :with_browser_locale
   skip_before_action :authenticate_user!
   skip_authorization_check
 
diff --git a/app/views/submissions_preview/completed.html.erb b/app/views/submissions_preview/completed.html.erb
index bcfea8f9..657eec51 100644
--- a/app/views/submissions_preview/completed.html.erb
+++ b/app/views/submissions_preview/completed.html.erb
@@ -28,6 +28,11 @@
           <%= f.hidden_field :submission_slug, value: @submission.slug %>
           <%= f.label :email, t('email'), class: 'label' %>
           <%= f.email_field :email, value: current_user&.email || params[:email], required: true, class: 'base-input', placeholder: t('send_copy_to_email') %>
+          <% if params[:status] == 'error' %>
+            <span class="label-text-alt text-red-400 mt-1">
+              <%= t('please_enter_your_email_address_associated_with_the_completed_submission') %>
+            </span>
+          <% end %>
         </div>
         <toggle-submit dir="auto" class="form-control">
           <%= f.button button_title(title: t('send_copy_to_email'), disabled_with: t('starting')), class: 'base-button' %>
diff --git a/config/locales/i18n.yml b/config/locales/i18n.yml
index f66a309d..d807d374 100644
--- a/config/locales/i18n.yml
+++ b/config/locales/i18n.yml
@@ -744,6 +744,7 @@ en: &en
   two_months: 2 months
   three_months: 3 months
   eu_data_residency: EU data residency
+  please_enter_your_email_address_associated_with_the_completed_submission: Please enter your email address associated with the completed submission.
   submission_sources:
     api: API
     bulk: Bulk Send
@@ -1555,6 +1556,7 @@ es: &es
   two_months: 2 meses
   three_months: 3 meses
   eu_data_residency: Datos alojados UE
+  please_enter_your_email_address_associated_with_the_completed_submission: Por favor, introduce tu dirección de correo electrónico asociada con el envío completado.
   submission_sources:
     api: API
     bulk: Envío masivo
@@ -2364,6 +2366,7 @@ it: &it
   two_months: 2 mesi
   three_months: 3 mesi
   eu_data_residency: "Dati nell'UE"
+  please_enter_your_email_address_associated_with_the_completed_submission: "Inserisci il tuo indirizzo email associato all'invio completato."
   submission_sources:
     api: API
     bulk: Invio massivo
@@ -3176,6 +3179,7 @@ fr: &fr
   two_months: 2 mois
   three_months: 3 mois
   eu_data_residency: "Données dans l'UE"
+  please_enter_your_email_address_associated_with_the_completed_submission: "Veuillez saisir l'adresse e-mail associée à l'envoi complété."
   submission_sources:
     api: API
     bulk: Envoi en masse
@@ -3987,6 +3991,7 @@ pt: &pt
   two_months: 2 meses
   three_months: 3 meses
   eu_data_residency: Dados na UE
+  please_enter_your_email_address_associated_with_the_completed_submission: Por favor, insira seu e-mail associado ao envio concluído.
   submission_sources:
     api: API
     bulk: Envio em massa
@@ -4799,6 +4804,7 @@ de: &de
   two_months: 2 Monate
   three_months: 3 Monate
   eu_data_residency: EU-Datenspeicher
+  please_enter_your_email_address_associated_with_the_completed_submission: Bitte gib deine E-Mail-Adresse ein, die mit der abgeschlossenen Übermittlung verknüpft ist.
   submission_sources:
     api: API
     bulk: Massenversand
@@ -4951,6 +4957,7 @@ pl:
   count_documents_signed_with_html: '<b>%{count}</b> dokumentów podpisanych za pomocą'
   open_source_documents_software: 'oprogramowanie do dokumentów open source'
   eu_data_residency: Dane w UE
+  please_enter_your_email_address_associated_with_the_completed_submission: Wprowadź adres e-mail powiązany z ukończonym zgłoszeniem.
 
 uk:
   require_phone_2fa_to_open: Вимагати двофакторну автентифікацію через телефон для відкриття
@@ -5019,6 +5026,7 @@ uk:
   count_documents_signed_with_html: '<b>%{count}</b> документів підписано за допомогою'
   open_source_documents_software: 'відкрите програмне забезпечення для документів'
   eu_data_residency: 'Зберігання даних в ЄС'
+  please_enter_your_email_address_associated_with_the_completed_submission: "Введіть адресу електронної пошти, пов'язану із завершеним поданням."
 
 cs:
   require_phone_2fa_to_open: Vyžadovat otevření pomocí telefonního 2FA
@@ -5087,6 +5095,7 @@ cs:
   count_documents_signed_with_html: '<b>%{count}</b> dokumentů podepsáno pomocí'
   open_source_documents_software: 'open source software pro dokumenty'
   eu_data_residency: 'Uložení dat v EU'
+  please_enter_your_email_address_associated_with_the_completed_submission: Zadejte e-mailovou adresu spojenou s dokončeným odesláním.
 
 he:
   require_phone_2fa_to_open: דרוש אימות דו-שלבי באמצעות טלפון לפתיחה
@@ -5155,6 +5164,7 @@ he:
   count_documents_signed_with_html: '<b>%{count}</b> מסמכים נחתמו באמצעות'
   open_source_documents_software: 'תוכנה בקוד פתוח למסמכים'
   eu_data_residency: 'נתונים באיחוד האירופי	'
+  please_enter_your_email_address_associated_with_the_completed_submission: 'אנא הזן את כתובת הדוא"ל המשויכת למשלוח שהושלם.'
 
 nl:
   require_phone_2fa_to_open: Vereis telefoon 2FA om te openen
@@ -5223,6 +5233,7 @@ nl:
   count_documents_signed_with_html: '<b>%{count}</b> documenten ondertekend met'
   open_source_documents_software: 'open source documenten software'
   eu_data_residency: Gegevens EU
+  please_enter_your_email_address_associated_with_the_completed_submission: Voer het e-mailadres in dat is gekoppeld aan de voltooide indiening.
 
 ar:
   require_phone_2fa_to_open: "تطلب فتح عبر تحقق الهاتف ذو العاملين"
@@ -5291,6 +5302,7 @@ ar:
   count_documents_signed_with_html: '<b>%{count}</b> مستندات تم توقيعها باستخدام'
   open_source_documents_software: 'برنامج مستندات مفتوح المصدر'
   eu_data_residency: 'بيانات في الاتحاد الأوروبي'
+  please_enter_your_email_address_associated_with_the_completed_submission: 'يرجى إدخال عنوان البريد الإلكتروني المرتبط بالإرسال المكتمل.'
 
 ko:
   require_phone_2fa_to_open: 휴대폰 2FA를 열 때 요구함
@@ -5359,6 +5371,7 @@ ko:
   count_documents_signed_with_html: '<b>%{count}</b>개의 문서가 다음을 통해 서명됨'
   open_source_documents_software: '오픈소스 문서 소프트웨어'
   eu_data_residency: 'EU 데이터 보관'
+  please_enter_your_email_address_associated_with_the_completed_submission: '완료된 제출과 연결된 이메일 주소를 입력하세요.'
 
 ja:
   require_phone_2fa_to_open: 電話による2段階認証が必要です
@@ -5427,6 +5440,7 @@ ja:
   count_documents_signed_with_html: '<b>%{count}</b> 件のドキュメントが以下で署名されました'
   open_source_documents_software: 'オープンソースのドキュメントソフトウェア'
   eu_data_residency: 'EU データ居住'
+  please_enter_your_email_address_associated_with_the_completed_submission: '完了した提出に関連付けられたメールアドレスを入力してください。'
 
 en-US:
   <<: *en
diff --git a/spec/system/submission_preview_spec.rb b/spec/system/submission_preview_spec.rb
index 54fb75f2..3048e96d 100644
--- a/spec/system/submission_preview_spec.rb
+++ b/spec/system/submission_preview_spec.rb
@@ -6,18 +6,54 @@ RSpec.describe 'Submission Preview' do
   let(:template) { create(:template, account:, author: user) }
 
   context 'when not submitted' do
-    let(:submission) { create(:submission, template:, created_by_user: user) }
+    let(:submission) { create(:submission, :with_submitters, template:, created_by_user: user) }
 
-    before do
-      template.submitters.map { |s| create(:submitter, submission:, uuid: s['uuid']) }
+    context 'when user is signed in' do
+      before do
+        sign_in(user)
 
-      sign_in(user)
+        visit submissions_preview_path(slug: submission.slug)
+      end
 
-      visit submissions_preview_path(slug: submission.slug)
+      it 'completes the form' do
+        expect(page).to have_content('Not completed')
+      end
     end
 
-    it 'completes the form' do
-      expect(page).to have_content('Not completed')
+    context 'when user is not signed in' do
+      context 'when submission is not completed' do
+        before do
+          create(:encrypted_config, account:, key: EncryptedConfig::EMAIL_SMTP_KEY, value: '{}')
+
+          submission.submitters.each { |s| s.update(completed_at: 1.day.ago) }
+
+          visit submissions_preview_path(slug: submission.slug)
+        end
+
+        it "sends a copy to the submitter's email" do
+          fill_in 'Email', with: submission.submitters.first.email
+          click_button 'Send copy to Email'
+
+          expect(page).to have_content('Email has been sent.')
+        end
+
+        it 'shows an error for an email not associated with the submission' do
+          fill_in 'Email', with: 'john.due@example.com'
+          click_button 'Send copy to Email'
+
+          expect(page).to have_content('Please enter your email address associated with the completed submission.')
+        end
+      end
+
+      it "doesn't display the email form if SMTP is not configured" do
+        submission.submitters.each { |s| s.update(completed_at: 1.day.ago) }
+
+        visit submissions_preview_path(slug: submission.slug)
+
+        expect(page).to have_content(template.name)
+        expect(page).not_to have_field('Email')
+        expect(page).not_to have_content('Send copy to Email')
+      end
     end
   end
 end