diff --git a/LDP/guide/docbook/Linux-Networking/Firewalling-and-Masquerading.xml b/LDP/guide/docbook/Linux-Networking/Firewalling-and-Masquerading.xml
index 70b9e847..d532f77e 100644
--- a/LDP/guide/docbook/Linux-Networking/Firewalling-and-Masquerading.xml
+++ b/LDP/guide/docbook/Linux-Networking/Firewalling-and-Masquerading.xml
@@ -15489,7 +15489,7 @@ bap@cs.unm.edu
 
 David C. Merrill
 
-david@lupercalia.net
+david -AT- lupercalia.net
 
 Copyright © 1996 by Barak Pearlmutter
 
diff --git a/LDP/guide/docbook/Linux-Networking/Sources.xml b/LDP/guide/docbook/Linux-Networking/Sources.xml
index 4f450954..ccd41ec7 100644
--- a/LDP/guide/docbook/Linux-Networking/Sources.xml
+++ b/LDP/guide/docbook/Linux-Networking/Sources.xml
@@ -160,7 +160,7 @@
 
 <itemizedlist>
 <listitem>
-<para>/usr/share/doc/FAQ/Linux-FAQ/index.html, ftp://rtfm.mit.edu/pub/usenet-by-hierarchy/comp/os/linux/misc/, David Merrill, david@lupercalia.net, Robert Kiesling, rkiesling@mainmatter.com, Linux Frequently Asked Questions with Answers, 2001-12-04.</para>
+<para>/usr/share/doc/FAQ/Linux-FAQ/index.html, ftp://rtfm.mit.edu/pub/usenet-by-hierarchy/comp/os/linux/misc/, David Merrill, david -AT- lupercalia.net, Robert Kiesling, rkiesling@mainmatter.com, Linux Frequently Asked Questions with Answers, 2001-12-04.</para>
 </listitem>
 </itemizedlist>