diff -r 8c973a2f4f50 Doc/whatsnew/3.6.rst
--- a/Doc/whatsnew/3.6.rst	Mon May 16 10:12:15 2016 +0300
+++ b/Doc/whatsnew/3.6.rst	Mon May 16 21:36:28 2016 +0300
@@ -554,6 +554,9 @@ Changes in the Python API
   an error (e.g. EBADF) was reported by the underlying system call.
   See :issue:`26685`.
 
+* The *decode_data* argument for :class:`smtpd.SMTPChannel` and
+  :class:`smtpd.SMTPServer` constructors is now ``False`` by default.
+
 Changes in the C API
 --------------------