Update preface.rst of DNSSEC Guide with new contact info for Josh Kuo

diff --git a/doc/dnssec-guide/preface.rst b/doc/dnssec-guide/preface.rst
index 68152c893cdb1b0fe2c674c80cc4053f242527d0..97fa965bc7d7ad42ba347011f66fc9ce22e08862 100644 (file)
--- a/doc/dnssec-guide/preface.rst
+++ b/doc/dnssec-guide/preface.rst
@@ -57,7 +57,7 @@ Acknowledgements
 
 This document was originally authored by Josh Kuo of `DeepDive
 Networking <https://www.deepdivenetworking.com/>`__. He can be reached
-at josh@deepdivenetworking.com.
+at josh.kuo@gmail.com.
 
 Thanks to the following individuals (in no particular order) who have
 helped in completing this document: Jeremy C. Reed, Heidi Schempf,