style(rubocop): Style/GlobalStdStream

lib/postal/config.rb

@@ -96,7 +96,7 @@ module Postal
     @loggers[name.to_sym] ||= begin
       require "postal/app_logger"
       if config.logging.stdout || ENV["LOG_TO_STDOUT"]
-        Postal::AppLogger.new(name, STDOUT)
+        Postal::AppLogger.new(name, $stdout)
       else
         FileUtils.mkdir_p(log_root)
         Postal::AppLogger.new(name, log_root.join("#{name}.log"), config.logging.max_log_files, config.logging.max_log_file_size.megabytes)

lib/postal/message_db/database.rb

@@ -341,7 +341,7 @@ module Postal
       end
 
       def logger
-        defined?(Rails) ? Rails.logger : Logger.new(STDOUT)
+        defined?(Rails) ? Rails.logger : Logger.new($stdout)
       end
 
       def slow_query_logger

lib/postal/smtp_server/server.rb

@@ -18,7 +18,7 @@ module Postal
         BasicSocket.do_not_reverse_lookup = true
 
         trap("USR1") do
-          STDOUT.puts "Received USR1 signal, respawning."
+          $stdout.puts "Received USR1 signal, respawning."
           fork do
             if ENV["APP_ROOT"]
               Dir.chdir(ENV["APP_ROOT"])
@@ -29,7 +29,7 @@ module Postal
         end
 
         trap("TERM") do
-          STDOUT.puts "Received TERM signal, shutting down."
+          $stdout.puts "Received TERM signal, shutting down."
           unlisten
         end
       end