Index: wp-admin/upgrade-functions.php
===================================================================
--- wp-admin/upgrade-functions.php	(revision 4279)
+++ wp-admin/upgrade-functions.php	(working copy)
@@ -105,7 +105,7 @@
 	$user = new WP_User($user_id);
 	$email = $user->user_email;
 	$name = $user->user_login;
-	$message_headers = 'From: ' . $blog_title . ' <wordpress@' . $_SERVER['SERVER_NAME'] . '>';
+	$message_headers = 'From: "' . $blog_title . '" <wordpress@' . $_SERVER['SERVER_NAME'] . '>';
 	$message = sprintf(__("Your new WordPress blog has been successfully set up at:
 
 %1\$s