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diff --git a/actionmailer/lib/action_mailer/vendor/tmail-1.2.3/tmail/net.rb b/actionmailer/lib/action_mailer/vendor/tmail-1.2.3/tmail/net.rb
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+++ b/actionmailer/lib/action_mailer/vendor/tmail-1.2.3/tmail/net.rb
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+#--
+# Copyright (c) 1998-2003 Minero Aoki <aamine@loveruby.net>
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+# Note: Originally licensed under LGPL v2+. Using MIT license for Rails
+# with permission of Minero Aoki.
+#++
+
+#:stopdoc:
+require 'nkf'
+#:startdoc:
+
+module TMail
+
+  class Mail
+    
+    def send_to( smtp )
+      do_send_to(smtp) do
+        ready_to_send
+      end
+    end
+
+    def send_text_to( smtp )
+      do_send_to(smtp) do
+        ready_to_send
+        mime_encode
+      end
+    end
+
+    def do_send_to( smtp )
+      from = from_address or raise ArgumentError, 'no from address'
+      (dests = destinations).empty? and raise ArgumentError, 'no receipient'
+      yield
+      send_to_0 smtp, from, dests
+    end
+    private :do_send_to
+
+    def send_to_0( smtp, from, to )
+      smtp.ready(from, to) do |f|
+        encoded "\r\n", 'j', f, ''
+      end
+    end
+
+    def ready_to_send
+      delete_no_send_fields
+      add_message_id
+      add_date
+    end
+
+    NOSEND_FIELDS = %w(
+      received
+      bcc
+    )
+
+    def delete_no_send_fields
+      NOSEND_FIELDS.each do |nm|
+        delete nm
+      end
+      delete_if {|n,v| v.empty? }
+    end
+
+    def add_message_id( fqdn = nil )
+      self.message_id = ::TMail::new_message_id(fqdn)
+    end
+
+    def add_date
+      self.date = Time.now
+    end
+
+    def mime_encode
+      if parts.empty?
+        mime_encode_singlepart
+      else
+        mime_encode_multipart true
+      end
+    end
+
+    def mime_encode_singlepart
+      self.mime_version = '1.0'
+      b = body
+      if NKF.guess(b) != NKF::BINARY
+        mime_encode_text b
+      else
+        mime_encode_binary b
+      end
+    end
+
+    def mime_encode_text( body )
+      self.body = NKF.nkf('-j -m0', body)
+      self.set_content_type 'text', 'plain', {'charset' => 'iso-2022-jp'}
+      self.encoding = '7bit'
+    end
+
+    def mime_encode_binary( body )
+      self.body = [body].pack('m')
+      self.set_content_type 'application', 'octet-stream'
+      self.encoding = 'Base64'
+    end
+
+    def mime_encode_multipart( top = true )
+      self.mime_version = '1.0' if top
+      self.set_content_type 'multipart', 'mixed'
+      e = encoding(nil)
+      if e and not /\A(?:7bit|8bit|binary)\z/i === e
+        raise ArgumentError,
+              'using C.T.Encoding with multipart mail is not permitted'
+      end
+    end
+  
+  end
+
+  #:stopdoc:
+  class DeleteFields
+
+    NOSEND_FIELDS = %w(
+      received
+      bcc
+    )
+
+    def initialize( nosend = nil, delempty = true )
+      @no_send_fields = nosend || NOSEND_FIELDS.dup
+      @delete_empty_fields = delempty
+    end
+
+    attr :no_send_fields
+    attr :delete_empty_fields, true
+
+    def exec( mail )
+      @no_send_fields.each do |nm|
+        delete nm
+      end
+      delete_if {|n,v| v.empty? } if @delete_empty_fields
+    end
+  
+  end
+  #:startdoc:
+
+  #:stopdoc:
+  class AddMessageId
+
+    def initialize( fqdn = nil )
+      @fqdn = fqdn
+    end
+
+    attr :fqdn, true
+
+    def exec( mail )
+      mail.message_id = ::TMail::new_msgid(@fqdn)
+    end
+  
+  end
+  #:startdoc:
+
+  #:stopdoc:
+  class AddDate
+
+    def exec( mail )
+      mail.date = Time.now
+    end
+  
+  end
+  #:startdoc:
+
+  #:stopdoc:
+  class MimeEncodeAuto
+
+    def initialize( s = nil, m = nil )
+      @singlepart_composer = s || MimeEncodeSingle.new
+      @multipart_composer  = m || MimeEncodeMulti.new
+    end
+
+    attr :singlepart_composer
+    attr :multipart_composer
+
+    def exec( mail )
+      if mail._builtin_multipart?
+      then @multipart_composer
+      else @singlepart_composer end.exec mail
+    end
+  
+  end
+  #:startdoc:
+  
+  #:stopdoc:
+  class MimeEncodeSingle
+
+    def exec( mail )
+      mail.mime_version = '1.0'
+      b = mail.body
+      if NKF.guess(b) != NKF::BINARY
+        on_text b
+      else
+        on_binary b
+      end
+    end
+
+    def on_text( body )
+      mail.body = NKF.nkf('-j -m0', body)
+      mail.set_content_type 'text', 'plain', {'charset' => 'iso-2022-jp'}
+      mail.encoding = '7bit'
+    end
+
+    def on_binary( body )
+      mail.body = [body].pack('m')
+      mail.set_content_type 'application', 'octet-stream'
+      mail.encoding = 'Base64'
+    end
+  
+  end
+  #:startdoc:
+  
+  #:stopdoc:
+  class MimeEncodeMulti
+
+    def exec( mail, top = true )
+      mail.mime_version = '1.0' if top
+      mail.set_content_type 'multipart', 'mixed'
+      e = encoding(nil)
+      if e and not /\A(?:7bit|8bit|binary)\z/i === e
+        raise ArgumentError,
+              'using C.T.Encoding with multipart mail is not permitted'
+      end
+      mail.parts.each do |m|
+        exec m, false if m._builtin_multipart?
+      end
+    end
+
+  end
+  #:startdoc:
+end   # module TMail