Index: src/wp-includes/functions.php
===================================================================
--- src/wp-includes/functions.php	(revision 42226)
+++ src/wp-includes/functions.php	(working copy)
@@ -5762,7 +5762,7 @@
 	 */
 	$send = apply_filters( 'send_site_admin_email_change_email', true, $old_email, $new_email );
 
-	if ( ! $send ) {
+	if ( ! $send || 'you@example.com' === $old_email ) {
 		return;
 	}
 
Index: src/wp-includes/ms-functions.php
===================================================================
--- src/wp-includes/ms-functions.php	(revision 42226)
+++ src/wp-includes/ms-functions.php	(working copy)
@@ -2674,7 +2674,7 @@
 	 */
 	$send = apply_filters( 'send_network_admin_email_change_email', true, $old_email, $new_email, $network_id );
 
-	if ( ! $send ) {
+	if ( ! $send || 'you@example.com' === $old_email ) {
 		return;
 	}