diff --git a/doc/emacs/ChangeLog b/doc/emacs/ChangeLog
index 549b677c4f2..43ae54b2c02 100644
--- a/doc/emacs/ChangeLog
+++ b/doc/emacs/ChangeLog
@@ -1,3 +1,7 @@
+2012-04-12  Glenn Morris  <rgm@gnu.org>
+
+	* ack.texi (Acknowledgments): Don't mention obsolete mailpost.el.
+
 2012-04-07  Glenn Morris  <rgm@gnu.org>
 
 	* emacsver.texi (EMACSVER): Bump version to 24.1.50.
diff --git a/doc/emacs/ack.texi b/doc/emacs/ack.texi
index be01b05fe19..17054c30329 100644
--- a/doc/emacs/ack.texi
+++ b/doc/emacs/ack.texi
@@ -251,10 +251,6 @@ color manipulation.  He also made various contributions to Gnus.
 Vivek Dasmohapatra wrote @file{htmlfontify.el}, to convert a buffer or
 source tree to HTML.
 
-@item
-Gary Delp wrote @file{mailpost.el}, an interface between RMAIL and the
-@file{/usr/uci/post} mailer.
-
 @item
 Matthieu Devin wrote @file{delsel.el}, a package to make newly-typed
 text replace the current selection.