diff --git a/app/services/merge/merge_organisations_service.rb b/app/services/merge/merge_organisations_service.rb
index 1ab115914..923f3c4b2 100644
--- a/app/services/merge/merge_organisations_service.rb
+++ b/app/services/merge/merge_organisations_service.rb
@@ -154,6 +154,8 @@ private
 
   def send_success_emails
     @absorbing_organisation.users.each do |user|
+      next unless user.active?
+
       merged_organisation, merged_user = find_merged_user_and_organization_by_email(user.email)
       if merged_user.present?
         MergeCompletionMailer.send_merged_organisation_success_mail(merged_user[:email], merged_organisation, @absorbing_organisation.name, @merge_date).deliver_later
diff --git a/spec/services/merge/merge_organisations_service_spec.rb b/spec/services/merge/merge_organisations_service_spec.rb
index 80ded190b..0e38b41f1 100644
--- a/spec/services/merge/merge_organisations_service_spec.rb
+++ b/spec/services/merge/merge_organisations_service_spec.rb
@@ -848,6 +848,18 @@ RSpec.describe Merge::MergeOrganisationsService do
         merge_organisations_service.call
       end
 
+      it "does not send a merge completion E-mail to deactivated merged organisation users" do
+        merging_organisation_user.update!(active: false)
+
+        expect(MergeCompletionMailer).to receive(:send_merged_organisation_success_mail).with(merging_organisation.data_protection_officers.first.email, "fake org", "absorbing org", Time.zone.today).once
+
+        expect(MergeCompletionMailer).not_to receive(:send_merged_organisation_success_mail).with(merging_organisation_user.email, "fake org", "absorbing org", Time.zone.today)
+        expect(MergeCompletionMailer).not_to receive(:send_merged_organisation_success_mail).with(absorbing_organisation.data_protection_officers.first.email, "fake org", "absorbing org", Time.zone.today)
+        expect(MergeCompletionMailer).not_to receive(:send_merged_organisation_success_mail).with(absorbing_organisation_user.email, "fake org", "absorbing org", Time.zone.today)
+
+        merge_organisations_service.call
+      end
+
       it "sends a merge completion E-mail to the original absorbing organisation users" do
         expect(MergeCompletionMailer).to receive(:send_absorbing_organisation_success_mail).with(absorbing_organisation.data_protection_officers.first.email, ["fake org"], "absorbing org", Time.zone.today).once
         expect(MergeCompletionMailer).to receive(:send_absorbing_organisation_success_mail).with(absorbing_organisation_user.email, ["fake org"], "absorbing org", Time.zone.today).once
@@ -857,6 +869,18 @@ RSpec.describe Merge::MergeOrganisationsService do
 
         merge_organisations_service.call
       end
+
+      it "does not send a merge completion E-mail to deactivated original absorbing organisation users" do
+        absorbing_organisation_user.update!(active: false)
+
+        expect(MergeCompletionMailer).to receive(:send_absorbing_organisation_success_mail).with(absorbing_organisation.data_protection_officers.first.email, ["fake org"], "absorbing org", Time.zone.today).once
+
+        expect(MergeCompletionMailer).not_to receive(:send_absorbing_organisation_success_mail).with(absorbing_organisation_user.email, ["fake org"], "absorbing org", Time.zone.today)
+        expect(MergeCompletionMailer).not_to receive(:send_absorbing_organisation_success_mail).with(merging_organisation_user.email, ["fake org"], "absorbing org", Time.zone.today)
+        expect(MergeCompletionMailer).not_to receive(:send_absorbing_organisation_success_mail).with(merging_organisation.data_protection_officers.first.email, ["fake org"], "absorbing org", Time.zone.today)
+
+        merge_organisations_service.call
+      end
     end
 
     context "when merging a multiple organisations into an existing organisation" do