style(rubocop): remaining offences

app/jobs/unqueue_message_job.rb

@@ -94,11 +94,11 @@ class UnqueueMessageJob < Postal::Job
                 log "#{log_prefix} Message is a bounce"
                 original_messages = queued_message.message.original_messages
                 unless original_messages.empty?
-                  queued_message.message.original_messages.each do |original_message|
-                    queued_message.message.update(bounce_for_id: original_message.id, domain_id: original_message.domain_id)
-                    queued_message.message.create_delivery("Processed", details: "This has been detected as a bounce message for <msg:#{original_message.id}>.")
-                    original_message.bounce!(queued_message.message)
-                    log "#{log_prefix} Bounce linked with message #{original_message.id}"
+                  queued_message.message.original_messages.each do |orig_msg|
+                    queued_message.message.update(bounce_for_id: orig_msg.id, domain_id: orig_msg.domain_id)
+                    queued_message.message.create_delivery("Processed", details: "This has been detected as a bounce message for <msg:#{orig_msg.id}>.")
+                    orig_msg.bounce!(queued_message.message)
+                    log "#{log_prefix} Bounce linked with message #{orig_msg.id}"
                   end
                   queued_message.destroy
                   next

app/models/concerns/has_authentication.rb

@@ -44,19 +44,4 @@ module HasAuthentication
 
 end
 
-class Postal::Errors::AuthenticationError < Postal::Error
-
-  attr_reader :error
-
-  def initialize(error)
-    super()
-    @error = error
-  end
-
-  def to_s
-    "Authentication Failed: #{@error}"
-  end
-
-end
-
 # -*- SkipSchemaAnnotations

app/models/domain.rb

@@ -85,7 +85,7 @@ class Domain < ApplicationRecord
   def parent_domains
     parts = name.split(".")
     parts[0, parts.size - 1].each_with_index.map do |_, i|
-      parts[i..-1].join(".")
+      parts[i..].join(".")
     end
   end