メール本文読み出しサンプル

read_mail.rb

require 'mail'
require 'nkf'
Dir.glob("*.eml").each do |eml|
  m = Mail.new(File.read(eml))
  File.open("#{eml}.txt", "w") do |f|
    f << m.subject
    f << "\n" * 3
    if m.multipart?
      m.parts.each do |part|
        f << NKF.nkf("-w -Lu -d", part.decoded)
      end
    else
      f << NKF.nkf("-w -Lu -d", m.body.decoded)
    end
    f << "\n" * 20
  end
end