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diff --git a/actionmailer/CHANGELOG.md b/actionmailer/CHANGELOG.md
index dc8c6bdf74..5a61746700 100644
--- a/actionmailer/CHANGELOG.md
+++ b/actionmailer/CHANGELOG.md
@@ -1,3 +1,50 @@
+*   Support the use of underscored symbols when registering interceptors and
+    observers like we do elsewhere within Rails.
+
+    *Andrew White*
+
+*   Add the ability to intercept emails before previewing in a similar fashion
+    to how emails can be intercepted before delivery.
+
+    Fixes #13622.
+
+    Example:
+
+        class CSSInlineStyler
+          def self.previewing_email(message)
+            # inline CSS styles
+          end
+        end
+
+        ActionMailer::Base.register_preview_interceptor CSSInlineStyler
+
+    *Andrew White*
+
+*   Add mailer previews feature based on 37 Signals mail_view gem.
+
+    *Andrew White*
+
+*   Calling `mail()` without arguments serves as getter for the current mail
+    message and keeps previously set headers.
+
+    Fixes #13090.
+
+    Example:
+
+        class MailerWithCallback < ActionMailer::Base
+          after_action :a_callback
+
+          def welcome
+            mail subject: "subject", to: ["joe@example.com"]
+          end
+
+          def a_callback
+            mail # => returns the current mail message
+          end
+        end
+
+    *Yves Senn*
+
 *   Instrument the generation of Action Mailer messages. The time it takes to
     generate a message is written to the log.