diff --git a/lib/tasks/collect_invalid_validation_contacts.rake b/lib/tasks/collect_invalid_validation_contacts.rake
new file mode 100644
index 000000000..227c6a2b5
--- /dev/null
+++ b/lib/tasks/collect_invalid_validation_contacts.rake
@@ -0,0 +1,78 @@
+namespace :collect_invalid_contacts do
+  desc 'Starts collect invalid validation contacts'
+  task all_domains: :environment do
+    prepare_csv_file
+
+    Contact.all.each do |contact|
+      email = convert_to_unicode(contact.email)
+      result = Truemail.validate(email, with: :mx)
+
+      collect_data_for_csv(contact, result.result) unless result.result.success
+    end
+  end
+end
+
+def find_related_domains(contact)
+  registrant_domains = Domain.where(registrant_id: contact.id)
+
+  tech_domains = collect_tech_domains(contact)
+  admin_domains = collect_admin_domains(contact)
+
+  tech_domains | admin_domains | registrant_domains
+end
+
+def collect_admin_domains(contact)
+  admin_domains = []
+
+  admin_contacts = AdminDomainContact.where(contact_id: contact.id)
+  admin_contacts.each do |c|
+    admin_domains << Domain.find(c.domain_id)
+  end
+
+  admin_domains
+end
+
+def collect_tech_domains(contact)
+  tech_domains = []
+
+  tech_contacts = TechDomainContact.where(contact_id: contact.id)
+  tech_contacts.each do |c|
+    tech_domains << Domain.find(c.domain_id)
+  end
+
+  tech_domains
+end
+
+def collect_data_for_csv(contact, result)
+  domains = find_related_domains(contact)
+  domains.reject! { |dom| dom.statuses.include? DomainStatus::FORCE_DELETE }
+
+  CSV.open('invalid_emails.csv', 'a') do |csv|
+    domains.each do |domain|
+      attrs = []
+      attrs.push(domain.name, contact.email, result.errors)
+
+      csv << attrs
+    end
+  end
+end
+
+def prepare_csv_file
+  headers = %w[
+    contact
+    domain
+    error
+  ]
+  csv = CSV.open('invalid_emails.csv', 'w')
+  csv << headers
+end
+
+def convert_to_unicode(email)
+  original_domain = Mail::Address.new(email).domain
+  decoded_domain = SimpleIDN.to_unicode(original_domain)
+
+  original_local = Mail::Address.new(email).local
+  decoded_local = SimpleIDN.to_unicode(original_local)
+
+  "#{decoded_local}@#{decoded_domain}"
+end