diff --git a/lib/tasks/resend_invitation_emails.rake b/lib/tasks/resend_invitation_emails.rake
new file mode 100644
index 000000000..cf8c1168e
--- /dev/null
+++ b/lib/tasks/resend_invitation_emails.rake
@@ -0,0 +1,9 @@
+namespace :emails do
+  desc "Resend invitation emails"
+  task :resend_invitation_emails, %i[] => :environment do |_task, _args|
+    users = User.where(sign_in_count: 0, active: true)
+    users.each(&:send_confirmation_instructions)
+
+    Rails.logger.info("Sent invitation emails to #{users.count} users.")
+  end
+end
diff --git a/spec/lib/tasks/resend_invitation_emails_spec.rb b/spec/lib/tasks/resend_invitation_emails_spec.rb
new file mode 100644
index 000000000..f66a8fc0b
--- /dev/null
+++ b/spec/lib/tasks/resend_invitation_emails_spec.rb
@@ -0,0 +1,124 @@
+require "rails_helper"
+require "rake"
+
+RSpec.describe "emails" do
+  describe ":resend_invitation_emails", type: :task do
+    subject(:task) { Rake::Task["emails:resend_invitation_emails"] }
+
+    let(:notify_client) { instance_double(Notifications::Client) }
+    let(:devise_notify_mailer) { DeviseNotifyMailer.new }
+
+    before do
+      Rake.application.rake_require("tasks/resend_invitation_emails")
+      Rake::Task.define_task(:environment)
+      task.reenable
+    end
+
+    context "when the rake task is run" do
+      let(:organisation) { create(:organisation, name: "test organisation") }
+
+      before do
+        allow(DeviseNotifyMailer).to receive(:new).and_return(devise_notify_mailer)
+        allow(devise_notify_mailer).to receive(:notify_client).and_return(notify_client)
+        allow(notify_client).to receive(:send_email).and_return(true)
+
+        organisation.users.destroy_all
+        create(:user, name: "new active user", email: "new_active_user@example.com", organisation:, confirmation_token: "abc", initial_confirmation_sent: false, old_user_id: nil, sign_in_count: 0)
+        create(:user, name: "active user", email: "active_user@example.com", organisation:, confirmation_token: "ghi", initial_confirmation_sent: true, old_user_id: "234", sign_in_count: 0)
+        LegacyUser.destroy_all
+        create(:user, name: "new active migrated user", email: "new_active_migrated_user@example.com", organisation:, confirmation_token: "def", initial_confirmation_sent: false, old_user_id: "123", sign_in_count: 0)
+        create(:user, name: "inactive user", email: "inactive_user@example.com", organisation:, confirmation_token: "jkl", initial_confirmation_sent: true, old_user_id: "345", active: false, sign_in_count: 0)
+        create(:user, name: "logged in user", email: "logged_in_user@example.com", organisation:, confirmation_token: "mno", initial_confirmation_sent: true, old_user_id: "456", sign_in_count: 1)
+      end
+
+      context "with active non migrated user before the initial invitation has been sent" do
+        let(:personalisation) do
+          {
+            name: "new active user",
+            email: "new_active_user@example.com",
+            organisation: "test organisation",
+            link: include("/account/confirmation?confirmation_token=abc"),
+          }
+        end
+
+        it "sends an initial invitation" do
+          expect(notify_client).to receive(:send_email).with(email_address: "new_active_user@example.com", template_id: User::CONFIRMABLE_TEMPLATE_ID, personalisation:).once
+          task.invoke
+        end
+      end
+
+      context "with active migrated user before the initial invitation has been sent" do
+        let(:personalisation) do
+          {
+            name: "new active migrated user",
+            email: "new_active_migrated_user@example.com",
+            organisation: "test organisation",
+            link: include("/account/confirmation?confirmation_token=def"),
+          }
+        end
+
+        it "sends an initial invitation" do
+          expect(notify_client).to receive(:send_email).with(email_address: "new_active_migrated_user@example.com", template_id: User::BETA_ONBOARDING_TEMPLATE_ID, personalisation:).once
+          task.invoke
+        end
+      end
+
+      context "with active user after the initial invitation has been sent" do
+        let(:personalisation) do
+          {
+            name: "active user",
+            email: "active_user@example.com",
+            organisation: "test organisation",
+            link: include("/account/confirmation?confirmation_token=ghi"),
+          }
+        end
+
+        it "sends a reinvitation" do
+          expect(notify_client).to receive(:send_email).with(email_address: "active_user@example.com", template_id: User::RECONFIRMABLE_TEMPLATE_ID, personalisation:).once
+          task.invoke
+        end
+      end
+
+      context "with inactive user" do
+        let(:personalisation) do
+          {
+            name: "inactive user",
+            email: "inactive_user@example.com",
+            organisation: "test organisation",
+            link: include("/account/confirmation?confirmation_token=jkl"),
+          }
+        end
+
+        it "does not send an invitation" do
+          expect(notify_client).not_to receive(:send_email).with(email_address: "inactive_user@example.com", template_id: User::CONFIRMABLE_TEMPLATE_ID, personalisation:)
+          expect(notify_client).not_to receive(:send_email).with(email_address: "inactive_user@example.com", template_id: User::RECONFIRMABLE_TEMPLATE_ID, personalisation:)
+          expect(notify_client).not_to receive(:send_email).with(email_address: "inactive_user@example.com", template_id: User::BETA_ONBOARDING_TEMPLATE_ID, personalisation:)
+          task.invoke
+        end
+      end
+
+      context "with logged in user" do
+        let(:personalisation) do
+          {
+            name: "logged in user",
+            email: "logged_in_user@example.com",
+            organisation: "test organisation",
+            link: include("/account/confirmation?confirmation_token=mno"),
+          }
+        end
+
+        it "does not send an invitation" do
+          expect(notify_client).not_to receive(:send_email).with(email_address: "logged_in_user@example.com", template_id: User::CONFIRMABLE_TEMPLATE_ID, personalisation:)
+          expect(notify_client).not_to receive(:send_email).with(email_address: "logged_in_user@example.com", template_id: User::RECONFIRMABLE_TEMPLATE_ID, personalisation:)
+          expect(notify_client).not_to receive(:send_email).with(email_address: "logged_in_user@example.com", template_id: User::BETA_ONBOARDING_TEMPLATE_ID, personalisation:)
+          task.invoke
+        end
+      end
+
+      it "prints out the total number of invitations sent" do
+        expect(Rails.logger).to receive(:info).with("Sent invitation emails to 3 users.")
+        task.invoke
+      end
+    end
+  end
+end