Honor action_domain in managesieve-forward (#7849)

plugins/managesieve/lib/Roundcube/rcube_sieve_forward.php

@@ -203,11 +203,15 @@ class rcube_sieve_forward extends rcube_sieve_engine
         $status = rcube_utils::get_input_value('forward_status', rcube_utils::INPUT_POST);
         $action = rcube_utils::get_input_value('forward_action', rcube_utils::INPUT_POST);
         $target = rcube_utils::get_input_value('action_target', rcube_utils::INPUT_POST, true);
+        $target_domain = rcube_utils::get_input_value('action_domain', rcube_utils::INPUT_POST);
 
         $date_extension = in_array('date', $this->exts);
         $forward_tests  = (array) $this->forward['tests'];
 
         if ($action == 'redirect' || $action == 'copy') {
+            if ($target_domain) {
+                $target .= '@' . $target_domain;
+            }
             if (empty($target) || !rcube_utils::check_email($target)) {
                 $error = 'noemailwarning';
             }