Index: wp-admin/user-new.php
===================================================================
--- wp-admin/user-new.php	(revision 18407)
+++ wp-admin/user-new.php	(working copy)
@@ -110,6 +110,7 @@
 			$new_user_login = apply_filters('pre_user_login', sanitize_user(stripslashes($_REQUEST['user_login']), true));
 			if ( isset( $_POST[ 'noconfirmation' ] ) && is_super_admin() ) {
 				add_filter( 'wpmu_signup_user_notification', '__return_false' ); // Disable confirmation email
+				add_filter( 'wpmu_welcome_user_notification', '__return_false' ); // Disable welcome email
 			}
 			wpmu_signup_user( $new_user_login, $_REQUEST[ 'email' ], array( 'add_to_blog' => $wpdb->blogid, 'new_role' => $_REQUEST[ 'role' ] ) );
 			if ( isset( $_POST[ 'noconfirmation' ] ) && is_super_admin() ) {