diff --git a/purge_inactive_users.rake b/purge_inactive_users.rake
new file mode 100644
index 0000000..f3e6130
--- /dev/null
+++ b/purge_inactive_users.rake
@@ -0,0 +1,17 @@
+namespace :zammad do
+  desc "Purge inactive users"
+  task purge_inactive_users: :environment do
+    User.joins('LEFT JOIN tickets ON tickets.customer_id = users.id')
+        .joins(:roles)
+        .where('roles.name = \'Customer\' AND tickets.state_id NOT IN (?) AND tickets.updated_at < ?', Ticket::State.where(name: ['new', 'open']).pluck(:id), 30.days.ago)
+        .distinct
+        .find_each do |user|
+      if Ticket.where(customer_id: user.id)
+               .where('state_id IN (?) AND updated_at >= ?', Ticket::State.where(name: ['new', 'open']).pluck(:id), 30.days.ago)
+               .empty?
+        user.destroy
+      end
+    end
+    puts "Purge complete."
+  end
+end