Add mailer

app/mailers/data_protection_confirmation_mailer.rb

@@ -0,0 +1,15 @@
+class DataProtectionConfirmationMailer < NotifyMailer
+  include Rails.application.routes.url_helpers
+  EMAIL_TEMPLATE_ID = "3dbf78fe-a2c8-4d65-aa19-e4d62695d4a9".freeze
+
+  def send_confirmation_email(user)
+    send_email(
+      user.email,
+      EMAIL_TEMPLATE_ID,
+      {
+        organisation_name: user.organisation.name,
+        link: data_sharing_agreement_organisation_url(user.organisation),
+      },
+    )
+  end
+end

spec/mailers/data_protection_confirmation_mailer_spec.rb

@@ -0,0 +1,27 @@
+require "rails_helper"
+
+RSpec.describe DataProtectionConfirmationMailer do
+  describe "#send_csv_download_mail" do
+    let(:notify_client) { instance_double(Notifications::Client) }
+    let(:user) { create(:user, email: "user@example.com") }
+    let(:organisation) { user.organisation }
+
+    before do
+      allow(Notifications::Client).to receive(:new).and_return(notify_client)
+      allow(notify_client).to receive(:send_email).and_return(true)
+    end
+
+    it "sends confirmation email to user" do
+      expect(notify_client).to receive(:send_email).with(
+        email_address: user.email,
+        template_id: "3dbf78fe-a2c8-4d65-aa19-e4d62695d4a9",
+        personalisation: {
+          organisation_name: organisation.name,
+          link: "#{ENV['APP_HOST']}/organisations/#{organisation.id}/data-sharing-agreement",
+        },
+      )
+
+      described_class.new.send_confirmation_email(user)
+    end
+  end
+end