How do I read the mail content?

[fifiteen82726]

I am doing this way

require 'gmail'
USERNAME = 'xxx'
PWD      = 'xxx'
gmail = Gmail.new(USERNAME, PWD)

gmail.inbox.emails.count
# 7394

gmail.inbox.emails.last
=> <#Message:70327319034880 mailbox=inbox uid=9818>

gmail.inbox.emails.last.message
=> #<Mail::Message:70327319519480, Multipart: true, Headers: <Return-Path: <3pKNdWQgTCzMcd-gTeanPRRdjcih.VddVaT.RdbclaXj.QdcXdVbPXa.Rdb@gaia.bounces.google.com>>, <Received: by 10.28.223.9 with SMTP id w9csp1538501wmg; Wed, 5 Jul 2017 19:42:45 -0700 (PDT)>, <Received: from mail-pg0-x245.google.com (mail-pg0-x245.google.com. [2607:f8b0:400e:c05::245]) by mx.google.com with ESMTPS id o27si405612pli.602.2017.07.05.19.42.44 for <nwliu.bonio@gmail.com> (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Jul 2017 19:42:45 -0700 (PDT)>, <Received: by mail-pg0-x245.google.com with SMTP id z1so6207408pgs.10 for <nwliu.bonio@gmail.com>; Wed, 05 Jul 2017 19:42:44 -0700 (PDT)>, <Date: Thu, 06 Jul 2017 02:42:40 +0000>, <From: Google <no-reply@accounts.google.com>>, <To: nwliu.bonio@gmail.com>, <Message-ID: <RINmyh7zHjhFN-0HCGcSFg@notifications.google.com>>, <Subject: =?UTF-8?B?5bey5ZWf55So5a6J5YWo5oCn6LyD5L2O55qE5oeJ55So56iL5byP5a2Y5Y+W5qyK?=>, <Mime-Version: 1.0>, <Content-Type: multipart/alternative; boundary="94eb2c13fab041830a05539d12b1">, <Delivered-To: nwliu.bonio@gmail.com>, <X-Received: by 10.99.168.5 with SMTP id o5mr8840927pgf.207.1499308965091; Wed, 05 Jul 2017 19:42:45 -0700 (PDT)>, <ARC-Seal: i=1; a=rsa-sha256; t=1499308965; cv=none; d=google.com; s=arc-20160816; b=N9DVXsaM9TeDXane6vYKW+PqtcqM14XXg2l1fyxqTOEbFU75vDgjSOLl+owgRoLQtd jG7NsfIJDdRlTIANErF6P3bbrS2vYZ2LluCOZsb9PQ3QcTov+HXPLVo6OJBUKs3zH/s0 R4RyvEUJgxh3f4wgIyAfE34tzlAjnety974dKcTLgaWpLMl/dRJRC9e2CZ0Iynkrk+Ct 9o1YfAh7ZFCvVoXxsa4jWgGVfuYkjNhlj90TESJClpJa4YscFNr5AZiXkMuUOyD+imJb EO0abA8GqmJ4wyfc+0OHcWmCBTorvKYDB7V6xo8yodIfzlnB7U8Gia5u4Pgj4g6br7zw W5Kw==>, <ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=to:from:subject:message-id:feedback-id:date:mime-version :dkim-signature:arc-authentication-results; bh=J8tuWNX9MU59+l6fzokgEdFYDHN6NqIS4Z5md7SzPv8=; b=aWj9kKK81awzTiDEcm8tW8T5hWrsKkOwsk0EBjmH4IrBKBjzX2KC5MDOKO7e7qzsx0

It seems the message is unreadable, how do I extract the content, sender and more information?

[0x1eef]

try message.parts and check out the documentation for the "mail" gem, the object returned by the message method is from that gem.