hog.rb

require "rubygems"
require "nkf"
require "kconv"
require "net/smtp"

# Hog - Japanese ISO2022JP Mail Sender
# ==== Description
# sending Japanase Mail with ISO-2022-JP encoding. 
# See the bottom of this source for a sample usage.
class Hog
  def self.mail(options)
    message, from, to = build_mail(options)
    Net::SMTP.start('localhost', 25) do |smtp|
      smtp.send_mail message, from, to
    end
    true
  rescue
    false
  end
  
  def self.gmail(options)
    require "tlsmail"
    
    account = options[:account]
    login   = options[:login]
    message, from, to = build_mail(options)
    Net::SMTP.enable_tls(OpenSSL::SSL::VERIFY_NONE)
    Net::SMTP.start('smtp.gmail.com', '587', "localhost", account, login, :plain) do |smtp|
      smtp.send_message message, from, to
    end
    true
  rescue
    false
  end
  
  def self.build_mail(options)
    to      = options[:to]
    sender  = options[:sender] || options[:from] || ''
    from    = options[:from] || 'hog@unknown'
    subject = options[:subject] || ''
    body    = options[:body] || ''

    message = <<EOT
From: #{iso2022jp_mime(sender)} <#{from}>
To: #{to.to_a.join(",\n ")}
Subject: #{iso2022jp_mime(subject)}
Date: #{Time::now.strftime("%a, %d %b %Y %X %z")}
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-2022-JP
Content-Transfer-Encoding: 7bit

#{NKF.nkf("-Wjm0", body)}
EOT
    
    [message, from, to]
  end
  
  def self.iso2022jp_mime(subject)
    "=?ISO-2022-JP?B?" + Kconv.tojis(subject).split(//,1).pack('m').chomp.delete("\r\n") + "?="
  end
end

# Usage
if __FILE__ == $0
  ja_txt = open('japanese.txt').read
  Hog.mail(:to => 'someone@example.com', :from => 'other@example.com', :subject => 'Hello', :body => ja_txt)
end