init push - laying out the project

proxy/Gemfile

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+source 'https://rubygems.org'
+ruby '2.6.5'
+gem 'dotenv-rails'
+
+# Reduces boot times through caching; required in config/boot.rb
+gem 'bootsnap', '>= 1.4.2', require: false
+
+group :development do
+  gem 'web-console', '>= 3.3.0'
+  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
+  gem 'spring'
+  gem 'spring-watcher-listen', '~> 2.0.0'
+end
+
+gem 'bunny'
+gem 'midi-smtp-server', '~> 3.0.1'
+gem 'openssl', '~> 2.1.0'

proxy/bettermail_proxy.rb

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+# frozen_string_literal: true
+
+require 'midi-smtp-server'
+
+# Server class
+class BettermailProxy < MidiSmtpServer::Smtpd
+
+  # get each message after DATA <message> .
+  def on_message_data_event(ctx)
+    # Just decode message once to make sure, that this message ist readable
+    mail = Mail.read_from_string(ctx[:message])
+
+    # Publish to rabbit
+    @bunny_exchange.publish(mail.to_s, :headers => { 'x-smtp' => mail.header.to_s }, :routing_key => "new_email")
+  end
+
+end
+
+# Create a new server instance for listening at localhost interfaces 127.0.0.1:2525
+# and accepting a maximum of 4 simultaneous connections per default
+server = MySmtpd.new
+
+# save flag for Ctrl-C pressed
+flag_status_ctrl_c_pressed = false
+
+# try to gracefully shutdown on Ctrl-C
+trap('INT') do
+  # print an empty line right after ^C
+  puts
+  # notify flag about Ctrl-C was pressed
+  flag_status_ctrl_c_pressed = true
+  # signal exit to app
+  exit 0
+end
+
+# Output for debug
+server.logger.info("Starting MySmtpd [#{MidiSmtpServer::VERSION::STRING}|#{MidiSmtpServer::VERSION::DATE}] (Basic usage) ...")
+
+# setup exit code
+at_exit do
+  # check to shutdown connection
+  if server
+    # Output for debug
+    server.logger.info('Ctrl-C interrupted, exit now...') if flag_status_ctrl_c_pressed
+    # info about shutdown
+    server.logger.info('Shutdown MySmtpd...')
+    # stop all threads and connections gracefully
+    server.stop
+  end
+  # Output for debug
+  server.logger.info('MySmtpd down!')
+end
+
+# Start the server
+server.start
+
+# Run on server forever
+server.join