Fix handling of string-list format values for date tests in Out of Office (#10075)

plugins/managesieve/Changelog

@@ -1,3 +1,5 @@
+- Fix handling of string-list format values for date tests in Out of Office (#10075)
+
 * version 9.6 [2025-11-29]
 -----------------------------------------------------------
 - Show a warning when actions in wrong order (#10015, #6590)

plugins/managesieve/lib/Roundcube/rcube_sieve_vacation.php

@@ -149,6 +149,14 @@ class rcube_sieve_vacation extends rcube_sieve_engine
                     }
                 }
 
+                // According to RFC5260, currentdate target can be a string-list,
+                // but here we support only a single value (#10074)
+                foreach ($rule['tests'] as $i => $r) {
+                    if ($r['test'] == 'currentdate' && is_array($r['arg'])) {
+                        $rule['tests'][$i]['arg'] = array_first($r['arg']);
+                    }
+                }
+
                 $this->vacation = array_merge($rule['actions'][0], [
                     'idx' => $idx,
                     'disabled' => $rule['disabled'] || !$active,