Ticket #17890: 17890.diff

wp-admin/network/site-new.php

@@ -44 +44 @@
                         wp_die( sprintf( __('The following words are reserved for use by WordPress functions and cannot be used as blog names: <code>%s</code>' ), implode( '</code>, <code>', $subdirectory_reserved_names ) ) );
         }
 
-        $email = sanitize_email( $blog['email'] );
+        $email = $blog['email'];
         $title = $blog['title'];
 
         if ( empty( $domain ) )
                 wp_die( __( 'Missing or invalid site address.' ) );
         if ( empty( $email ) )
                 wp_die( __( 'Missing email address.' ) );
-        if ( !is_email( $email ) )
+        if ( ! ( $email = sanitize_email( $email ) ) )
                 wp_die( __( 'Invalid email address.' ) );
 
         if ( is_subdomain_install() ) {