Ruby script to get a mail via alias of postfix.

get_mail.rb

#! /usr/local/bin/ruby
# coding: utf-8
#-------------------------------------------------
# Ruby script to get a mail via alias of postfix.
#-------------------------------------------------
require 'mail'

class GetMail
  def initialize
    dt = Time.now.strftime("%Y%m%d_%H%M%S%L")
    @out_file = "/path/to/#{dt}.txt"
  end

  def execute
    open(@out_file, "w") do |f|
      mail = Mail.new($stdin.read)
      f.puts "From:    #{mail.from.first}"
      f.puts "To:      #{mail.to.first}"
      f.puts "Date:    #{mail.date}"
      f.puts "Subject: #{mail.subject}"
      f.puts "Body:\n#{mail.body.decoded.encode("UTF-8", mail.charset)}"
    end
  rescue => e
    $stderr.puts "[#{e.class}] #{e.message}"
    e.backtrace.each{|trace| $stderr.puts "\t#{trace}"}
    exit 1
  end
end

exit unless $0 == __FILE__
GetMail.new.execute