test = "Delivered-To: twtbot@gmail.com
Received: by 10.114.155.8 with SMTP id c8cs261037wae;
        Thu, 22 Jan 2009 18:13:17 -0800 (PST)
MIME-Version: 1.0
Sender: neufelry@gmail.com
Received: by 10.114.92.14 with SMTP id p14mr4207993wab.140.1232676797484; Thu,
  22 Jan 2009 18:13:17 -0800 (PST)
Date: Thu, 22 Jan 2009 20:13:17 -0600
X-Google-Sender-Auth: ac619f32b7c737b4
Message-ID: <70fc96270901221813w5e7e8946td90f532cdc57d8c3@mail.gmail.com>
Subject: test
From: Ryan Neufeld <rkneufeld@gmail.com>
To: twtbot@gmail.com
Content-Type: multipart/alternative; boundary=00163646cbf6a30f1204611cee3c

--00163646cbf6a30f1204611cee3c
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

off

--00163646cbf6a30f1204611cee3c
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

off

--00163646cbf6a30f1204611cee3c--
"

DELIVERED_TO         = /^Delivered-To:/
RECEIVED             = /^Received:/
MIME_VERSION         = /^MIME-Version:/
DATE                 = /^Date:/
X_GOOGLE_SENDER_AUTH = /^X-Google-Sender-Auth:/
MESSAGE_ID           = /^Message-ID:/
SUBJECT              = /^Subject:/
FROM                 = /^From:/
TO                   = /^To:/
CONTENT_TYPE         =/^Content-Type:/

@email = {}
@email[:ignore] =[]
prev = :ignore
test.each_line do |line|
  prev = case line
    when DELIVERED_TO
      (@email[:delivered_to] ||= [])           << line.gsub( DELIVERED_TO , '')
      :delivered_to
    when RECEIVED
      (@email[:recieved] ||= [])               << line.gsub( RECEIVED , '')
      :recieved
    when MIME_VERSION
      (@email[:mime_version] ||= [])           << line.gsub( MIME_VERSION , '')
      :mime_version
    when DATE
      (@email[:date] ||= [])                   << line.gsub( DATE , '')
      :date
    when X_GOOGLE_SENDER_AUTH
      (@email[:x_google_sender_auth] ||= [])   << line.gsub( X_GOOGLE_SENDER_AUTH , '')
      :x_google_sender_auth
    when MESSAGE_ID
      (@email[:message_id] ||= [])             << line.gsub( MESSAGE_ID, '')
      :message_id
    when SUBJECT
      (@email[:subject] ||= [])                << line.gsub( SUBJECT , '')
      :subject
    when FROM
      (@email[:from] ||= [])                   << line.gsub( FROM , '')
      :from
    when TO
      (@email[:to] ||= [])                     << line.gsub( TO , '')
      :to
    when CONTENT_TYPE
      (@email[:content_type] ||= [])           << line.gsub( CONTENT_TYPE, '')
      :content_type
    else
      @email[prev] << line
    prev
  end
end

puts @email.inspect