diff --git a/Misc/NEWS b/Misc/NEWS
index 5be3e1c..e720196 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -67,6 +67,9 @@
 Library
 -------
 
+- Issue #6589: cleanup asyncore.socket_map in case smtpd.SMTPServer constructor 
+  raises an exception.
+
 - Issue #9075: In the ssl module, remove the setting of a ``debug`` flag
   on an OpenSSL structure.