Implemented job and test

app/jobs/bounced_emails_cleaner_job.rb

@@ -0,0 +1,10 @@
+class BouncedEmailsCleanerJob < ApplicationJob
+  queue_as :default
+
+  def perform
+    BouncedMailAddress.find_each do |bounce|
+        count = Contact.where(email: bounce.email).count
+        bounce.destroy if count == 0
+      end
+  end
+end

test/models/bounced_mail_address_test.rb

@@ -16,6 +16,21 @@ class BouncedMailAddressTest < ActiveSupport::TestCase
     @contact_email = "john@inbox.test"
   end
 
+  def test_remove_bounced_email_after_changed_related_email
+    @bounced_mail.update(email: @contact_email)
+    @bounced_mail.save
+
+    contacts_with_bounced_mails = Contact.where(email: @contact_email)
+    contacts_with_bounced_mails.each do |contact|
+      contact.email = "sara@inbox.com"
+      contact.save
+    end
+
+    BouncedEmailsCleanerJob.perform_now
+
+    assert_nil BouncedMailAddress.find_by(email: @contact_email)
+  end
+
   def test_soft_force_delete_related_domains
     domain_contacts = Contact.where(email: @contact_email).map(&:domain_contacts).flatten