gistfile1.rb

# ruby -v
ruby 1.9.2dev (2010-07-11 revision 28618) [x86_64-darwin10.4.0]

# gem list mail
mail (2.2.5)

irb> require 'mail'

irb> source =<<EOT
Received: by 10.220.95.198 with SMTP id e6cs20153vcn;
        Tue, 3 Aug 2010 13:56:07 -0700 (PDT)
From: Foobar <foobar@example.com>
To: Test <test@example.com>
Content-Class: urn:content-classes:message
Date: Tue, 3 Aug 2010 22:56:04 +0200
Subject: Test
Message-ID: <A1EFE6B6EFCD5D46AE11D0D2735A537120420A2DCE@localhost>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: text/plain; charset="windows-1252"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0

Testing encoded text, like m=E5 and =F8delegge, v=E6re

/Foobar, Ingeni=F8r
EOT

irb> mail = Mail.new source

irb> mail.content_transfer_encoding
 => "quoted-printable"

irb> mail.charset
 => "windows-1252"

irb> mail.body.encoding
 => "quoted-printable"

irb> mail.body.charset
 => "US-ASCII"

irb> mail.body.to_s.encoding
 => #<Encoding:US-ASCII> 

irb> mail.body.to_s
 => "Testing encoded text, like m\xE5 and \xF8delegge, v\xE6re\r\n\r\n/Foobar, Ingeni\xF8r"

irb> mail.body.to_s == mail.body.decoded
 => true

irb> mail.body.charset = mail.charset
 => "windows-1252"

irb> mail.body.to_s.encoding
 => #<Encoding:US-ASCII>