style(rubocop): Lint/UnusedBlockArgument

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 |p, i|
+    parts[0, parts.size - 1].each_with_index.map do |_, i|
       parts[i..-1].join(".")
     end
   end

app/models/outgoing_message_prototype.rb

@@ -137,7 +137,7 @@ class OutgoingMessagePrototype
     end
 
     if attachments.present?
-      attachments.each_with_index do |attachment, index|
+      attachments.each do |attachment|
         if attachment[:name].blank?
           @errors << "AttachmentMissingName" unless @errors.include?("AttachmentMissingName")
         elsif attachment[:data].blank?

app/models/route.rb

@@ -117,7 +117,7 @@ class Route < ApplicationRecord
         if route.save
           seen << route.id
         else
-          route.errors.each do |field, message|
+          route.errors.each do |_, message|
             errors.add :base, message
           end
           raise ActiveRecord::RecordInvalid

app/models/server.rb

@@ -157,7 +157,7 @@ class Server < ApplicationRecord
       time = Time.now.utc
       total_outgoing = 0.0
       total_bounces = 0.0
-      message_db.statistics.get(:daily, [:outgoing, :bounces], time, 30).each do |date, stat|
+      message_db.statistics.get(:daily, [:outgoing, :bounces], time, 30).each do |_, stat|
         total_outgoing += stat[:outgoing]
         total_bounces += stat[:bounces]
       end