
  1   ˆl–Ü4ý(ÔÂXÔÒnãMÜJbÑ¿Ê„d¶_ŒuÐb&=LYl~¿ÉÈ ?÷     # = net/smtp.rb
#
# Copyright (c) 1999-2007 Yukihiro Matsumoto.
#
# Copyright (c) 1999-2007 Minero Aoki.
#
# Written & maintained by Minero Aoki <aamine@loveruby.net>.
#
# Documented by William Webber and Minero Aoki.
#
# This program is free software. You can re-distribute and/or
# modify this program under the same terms as Ruby itself.
#
# NOTE: You can find Japanese version of this document at:
# http://www.ruby-lang.org/ja/man/html/net_smtp.html
#
# $Id: smtp.rb 44980 2014-02-15 15:45:14Z nagachika $
#
# See Net::SMTP for documentation.
#

require 'net/protocol'
require 'digest/md5'
require 'timeout'
begin
  require 'openssl'
rescue LoadError
end

module Net

  # Module mixed in to all SMTP error classes
  module SMTPError
    # This *class* is a module for backward compatibility.
    # In later release, this module becomes a class.
  end

  # Represents an SMTP authentication error.
  class SMTPAuthenticationError < ProtoAuthError
    include SMTPError
  end

  # Represents SMTP error code 420 or 450, a temporary error.
  class SMTPServerBusy < ProtoServerError
    include SMTPError
  end

  # Represents an SMTP command syntax error (error code 500)
  class SMTPSyntaxError < ProtoSyntaxError
    include SMTPError
  end

  # Represents a fatal SMTP error (error code 5xx, except for 500)
  class SMTPFatalError < ProtoFatalError
    include SMTPError
  end

  # Unexpected reply code returned from server.
  class SMTPUnknownError < ProtoUnknownError
    include SMTPError
  end

  # Command is not supported on server.
  class SMTPUnsupportedCommand < ProtocolError
    include SMTPError
  end

  #
  # == What is This Library?
  #
  # This library provides functionality to send internet
  # mail via SMTP, the Simple Mail Transfer Protocol. For details of
  # SMTP itself, see [RFC2821] (http://www.ietf.org/rfc/rfc2821.txt).
  #
  # == What is This Library NOT?
  #
  # This library does NOT provide functions to compose internet mails.
  # You must create them by yourself. If you want better mail support,
  # try RubyMail or TMail or search for alternatives in
  # {RubyGems.org}[https://rubygems.org/] or {The Ruby
  # Toolbox}[https://www.ruby-toolbox.com/].
  #
  # FYI: the official documentation on internet mail is: [RFC2822] (http://www.ietf.org/rfc/rfc2822.txt).
  #
  # == Examples
  #
  # === Sending Messages
  #
  # You must open a connection to an SMTP server before sending messages.
  # The first argument is the address of your SMTP server, and the second
  # argument is the port number. Using SMTP.start with a block is the simplest
  # way to do this. This way, the SMTP connection is closed automatically
  # after the block is executed.
  #
  #     require 'net/smtp'
  #     Net::SMTP.start('your.smtp.server', 25) do |smtp|
  #       # Use the SMTP object smtp only in this block.
  #     end
  #
  # Replace 'your.smtp.server' with your SMTP server. Normally
  # your system manager or internet provider supplies a server
  # for you.
  #
  # Then you can send messages.
  #
  #     msgstr = <<END_OF_MESSAGE
  #     From: Your Name <your@mail.address>
  #     To: Destination Address <someone@example.com>
  #     Subject: test message
  #     Date: Sat, 23 Jun 2001 16:26:43 +0900
  #     Message-Id: <unique.message.id.string@example.com>
  #
  #     This is a test message.
  #     END_OF_MESSAGE
  #
  #     require 'net/smtp'
  #     Net::SMTP.start('your.smtp.server', 25) do |smtp|
  #       smtp.send_message msgstr,
  #                         'your@mail.address',
  #                         'his_address@example.com'
  #     end
  #
  # === Closing the Session
  #
  # You MUST close the SMTP session after sending messages, by calling
  # the #finish method:
  #
  #     # using SMTP#finish
  #     smtp = Net::SMTP.start('your.smtp.server', 25)
  #     smtp.send_message msgstr, 'from@address', 'to@address'
  #     smtp.finish
  #
  # You can also use the block form of SMTP.start/SMTP#start.  This closes
  # the SMTP session automatically:
  #
  #     # u