#!/usr/bin/ruby -w
require 'net/imap'
require 'net/smtp'
imap_server = 'myserver'
app_dir="myrailsapppath"
cmd = "script/runner 'IncomingCommandHandler.receive(STDIN.read)'"
username = 'myuser'
password = 'mypass'
conn = imap = Net::IMAP.new(imap_server, 143)
Dir.chdir(app_dir)
conn.login(username, password)
conn.select('INBOX')
conn.search(['UNSEEN']).each do |message_id|
  envelope = imap.fetch(message_id, "ENVELOPE")[0].attr["ENVELOPE"]
  puts `echo #{envelope} | #{cmd}`
end
conn.disconnect