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diff --git a/actionmailer/CHANGELOG b/actionmailer/CHANGELOG
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--- a/actionmailer/CHANGELOG
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@@ -1,3 +1,36 @@
+*Mail Integration
+
+* ActionMailer::Base :default_implicit_parts_order now is in the sequence of the order you want, no
+reversing of ordering takes place.  The default order now is text/plain, then text/enriched, then 
+text/html and then any other part that is not one of these three.
+
+* Mail does not have "quoted_body", "quoted_subject" etc.  All of these are accessed via body.encoded, 
+  subject.encoded etc
+
+* Every part of a Mail object returns an object, never a string.  So Mail.body returns a Mail::Body
+  class object, need to call #encoded or #decoded to get the string you want.
+  
+* By default, a field will return the #decoded value when you send it :to_s and any object that
+  is a container (like header, body etc) will return #encoded value when you send it :to_s
+
+* Mail::Message#set_content_type does not exist, it is simply Mail::Message#content_type
+
+* Every mail message gets a unique message_id unless you specify one, had to change all the tests that
+  check for equality with expected.encoded == actual.encoded to first replace their message_ids with
+  control values
+
+* Mail now has a proper concept of parts, remove the ActionMailer::Part and ActionMailer::PartContainer classes
+
+* Calling #encoded on any object returns it as a string ready to go into the output stream of an email, this
+  means it includes the \r\n at the end of the lines and the object is pre-wrapped with \r\n\t if it is a
+  header field.  Also, the "encoded" value includes the field name if it is a header field.
+
+* Attachments are only the actual attachment, with filename etc.  A part contains an attachment.  The part
+  has the content_type etc.  So attachments.last.content_type is invalid.  But parts.last.content_type
+  
+* There is no idea of a "sub_head" in Mail.  A part is just a Message with some extra functionality, so it 
+  just has a "header" like a normal mail message
+
 *2.3.2 [Final] (March 15, 2009)*
 
 * Fixed that ActionMailer should send correctly formatted Return-Path in MAIL FROM for SMTP #1842 [Matt Jones]