diff --git a/app/controllers/users/registrations_controller.rb b/app/controllers/users/registrations_controller.rb
index 95be35e5b..6bbcbdf4a 100644
--- a/app/controllers/users/registrations_controller.rb
+++ b/app/controllers/users/registrations_controller.rb
@@ -17,7 +17,11 @@ class Users::RegistrationsController < Devise::RegistrationsController
   def create
     user = User.find_by(email: params[:user][:email])
     if user.present?
-      UserMailer.new_account_warning(user).deliver_later
+      if user.confirmed?
+        UserMailer.new_account_warning(user).deliver_later
+      else
+        user.resend_confirmation_instructions
+      end
       flash.notice = t('devise.registrations.signed_up_but_unconfirmed')
       redirect_to root_path
     else
diff --git a/spec/controllers/users/registrations_controller_spec.rb b/spec/controllers/users/registrations_controller_spec.rb
index baebdd389..1c9a5793b 100644
--- a/spec/controllers/users/registrations_controller_spec.rb
+++ b/spec/controllers/users/registrations_controller_spec.rb
@@ -34,16 +34,34 @@ describe Users::RegistrationsController, type: :controller do
     end
 
     context 'when the user already exists' do
-      let!(:existing_user) { create(:user, email: email, password: password) }
+      let!(:existing_user) { create(:user, email: email, password: password, confirmed_at: confirmed_at) }
 
       before do
         allow(UserMailer).to receive(:new_account_warning).and_return(double(deliver_later: 'deliver'))
-        subject
       end
 
-      it { expect(response).to redirect_to(root_path) }
-      it { expect(flash.notice).to eq(I18n.t('devise.registrations.signed_up_but_unconfirmed')) }
-      it { expect(UserMailer).to have_received(:new_account_warning) }
+      context 'and the user is confirmed' do
+        let(:confirmed_at) { DateTime.now }
+
+        before { subject }
+
+        it { expect(response).to redirect_to(root_path) }
+        it { expect(flash.notice).to eq(I18n.t('devise.registrations.signed_up_but_unconfirmed')) }
+        it { expect(UserMailer).to have_received(:new_account_warning) }
+      end
+
+      context 'and the user is not confirmed' do
+        let(:confirmed_at) { nil }
+
+        before do
+          expect_any_instance_of(User).to receive(:resend_confirmation_instructions)
+          subject
+        end
+
+        it { expect(response).to redirect_to(root_path) }
+        it { expect(flash.notice).to eq(I18n.t('devise.registrations.signed_up_but_unconfirmed')) }
+        it { expect(UserMailer).not_to have_received(:new_account_warning) }
+      end
     end
   end
 end