Remove constant email addresses in favour of env variable.

app/mailers/claims/esfa_mailer.rb

@@ -1,10 +1,13 @@
 class Claims::ESFAMailer < Claims::ApplicationMailer
-  ESFA_EMAIL_ADDRESS = "esfa@example.com".freeze
-  private_constant :ESFA_EMAIL_ADDRESS
-
   def claims_require_clawback(url_for_csv)
-    notify_email to: ESFA_EMAIL_ADDRESS,
+    notify_email to: esfa_email_addresses,
                  subject: t(".subject"),
                  body: t(".body", url_for_csv:, support_email:, service_name:)
   end
+
+  private
+
+  def esfa_email_addresses
+    ENV["CLAIMS_ESFA_EMAIL_ADDRESSES"].split(",")
+  end
 end

spec/mailers/claims/esfa_mailer_spec.rb

@@ -5,12 +5,16 @@
     subject(:claims_require_clawback_email) { described_class.claims_require_clawback(url_for_csv) }
 
     let(:url_for_csv) { "https://example.com" }
-    let(:esfa_email) { "esfa@example.com" }
+    let(:esfa_emails) { %w[example1@education.gov.uk example2@education.gov.uk] }
     let(:service_name) { "Claim funding for mentor training" }
     let(:support_email) { "ittmentor.funding@education.gov.uk" }
 
+    before do
+      stub_const("ENV", { "CLAIMS_ESFA_EMAIL_ADDRESSES" => esfa_emails })
+    end
+
     it "sends the claims require clawback email" do
-      expect(claims_require_clawback_email.to).to contain_exactly(esfa_email)
+      expect(claims_require_clawback_email.to).to match_array(esfa_emails)
       expect(claims_require_clawback_email.subject).to eq("Claims requiring clawback - Claim funding for mentor training")
       expect(claims_require_clawback_email.body.to_s.squish).to eq(<<~EMAIL.squish)
         To ESFA,