1 files changed, 27 insertions, 2 deletions
diff --git a/actionmailer/lib/action_mailer/deprecated_api.rb b/actionmailer/lib/action_mailer/deprecated_api.rb
index 0eb8d85676..61101c26a1 100644
--- a/actionmailer/lib/action_mailer/deprecated_api.rb
+++ b/actionmailer/lib/action_mailer/deprecated_api.rb
@@ -5,8 +5,25 @@ module ActionMailer
   module DeprecatedApi #:nodoc:
     extend ActiveSupport::Concern
 
-    module ClassMethods
+    included do
+      [:charset, :content_type, :mime_version, :implicit_parts_order].each do |method|
+        class_eval <<-FILE, __FILE__, __LINE__ + 1
+          def self.default_#{method}
+            @@default_#{method}
+          end
+
+          def self.default_#{method}=(value)
+            ActiveSupport::Deprecation.warn "ActionMailer::Base.default_#{method}=value is deprecated, " <<
+              "use defaults :#{method} => value instead"
+            @@default_#{method} = value
+          end
+
+          @@default_#{method} = nil
+        FILE
+      end
+    end
 
+    module ClassMethods
       # Deliver the given mail object directly. This can be used to deliver
       # a preconstructed mail object, like:
       #
@@ -99,7 +116,15 @@ module ActionMailer
     end
 
   private
-    
+
+    def initialize_defaults(*)
+      @charset              ||= self.class.default_charset.try(:dup)
+      @content_type         ||= self.class.default_content_type.try(:dup)
+      @implicit_parts_order ||= self.class.default_implicit_parts_order.try(:dup)
+      @mime_version         ||= self.class.default_mime_version.try(:dup)
+      super
+    end
+
     def create_parts
       if @body.is_a?(Hash) && !@body.empty?
         ActiveSupport::Deprecation.warn "Giving a hash to body is deprecated, please use instance variables instead", caller[0,2]