diff --git a/ingo/docs/CHANGES b/ingo/docs/CHANGES
index b4d22b4fd57..c38a1753144 100644
--- a/ingo/docs/CHANGES
+++ b/ingo/docs/CHANGES
@@ -2,8 +2,7 @@
 v4.0.0-git
 ----------
 
-[jan] Allow to set vaction with only start or end date, if Sieve date extension
-      is available.
+[jan] Allow to set vaction with only start or end date, if supported.
 [jan] Add support for Sieve date extension to vacation messages (Request
       #12520).
 [mjr] Export active vacation messages via the timeObjects API (Request #10885).
diff --git a/ingo/lib/Script/Maildrop/Recipe.php b/ingo/lib/Script/Maildrop/Recipe.php
index dd4f8b7a699..9954dec2be9 100644
--- a/ingo/lib/Script/Maildrop/Recipe.php
+++ b/ingo/lib/Script/Maildrop/Recipe.php
@@ -154,12 +154,17 @@ public function __construct($params = array(), $scriptparams = array())
             }
 
             // Rule : Start/End of vacation
-            if (($start != 0) && ($end !== 0)) {
+            if ($start != 0 || $end != 0) {
                 $this->_action[] = '  flock "$HOME/vacationprocess.lock" {';
                 $this->_action[] = '    current_time=time';
                 $this->_action[] = '      if ( \ ';
-                $this->_action[] = '        ($current_time >= ' . $start . ') && \ ';
-                $this->_action[] = '        ($current_time <= ' . $end . ')) ';
+                if ($start != 0) {
+                    $this->_action[] = '        ($current_time >= ' . $start
+                        . ($end != 0 ? ') && \ ' : ') ');
+                }
+                if ($end != 0) {
+                    $this->_action[] = '        ($current_time <= ' . $end . ')) ';
+                }
                 $this->_action[] = '      {';
             }
             $this->_action[] = '  cc "' . str_replace('"', '\\"', sprintf(
diff --git a/ingo/lib/Script/Procmail/Recipe.php b/ingo/lib/Script/Procmail/Recipe.php
index dfdd82fe620..97638e6897e 100644
--- a/ingo/lib/Script/Procmail/Recipe.php
+++ b/ingo/lib/Script/Procmail/Recipe.php
@@ -148,8 +148,6 @@ public function __construct($params = array(), $scriptparams = array())
 
         case 'Ingo_Rule_System_Vacation':
             $days = $params['action-value']['days'];
-            $timed = !empty($params['action-value']['start']) &&
-                !empty($params['action-value']['end']);
             $this->_action[] = '{';
             foreach ($params['action-value']['addresses'] as $address) {
                 if (empty($address)) {
@@ -174,9 +172,11 @@ public function __construct($params = array(), $scriptparams = array())
                         . 'test $FILEDATE -le $DATE && '
                         . 'rm ${VACATION_DIR:-.}/\'.vacation.' . $address . '\'`';
                 }
-                if ($timed) {
+                if (!empty($params['action-value']['start'])) {
                     $this->_action[] = '    START='
                         . $params['action-value']['start'];
+                }
+                if (!empty($params['action-value']['end'])) {
                     $this->_action[] = '    END='
                         . $params['action-value']['end'];
                 }
@@ -186,9 +186,20 @@ public function __construct($params = array(), $scriptparams = array())
                 $this->_action[] = '';
                 $this->_action[] =
                     '    :0 Wc: ${VACATION_DIR:-.}/vacation.lock';
-                if ($timed) {
-                    $this->_action[] =
-                        '    * ? test $DATE -gt $START && test $END -gt $DATE';
+                if (!empty($params['action-value']['start']) ||
+                    !empty($params['action-value']['end'])) {
+                    $test = '    * ?';
+                    if (!empty($params['action-value']['start'])) {
+                        $test .= ' test $DATE -gt $START';
+                    }
+                    if (!empty($params['action-value']['start']) &&
+                        !empty($params['action-value']['end'])) {
+                        $test .= ' &&';
+                    }
+                    if (!empty($params['action-value']['end'])) {
+                        $test .= ' test $END -gt $DATE';
+                    }
+                    $this->_action[] = $test;
                 }
                 $this->_action[] = '    {';
                 $this->_action[] = '      :0 Wh';
diff --git a/ingo/package.xml b/ingo/package.xml
index d99e730a5cf..ff3f9377c2f 100644
--- a/ingo/package.xml
+++ b/ingo/package.xml
@@ -33,7 +33,7 @@
  </stability>
  <license uri="http://www.horde.org/licenses/apache">ASL</license>
  <notes>
-* [jan] Allow to set vaction with only start or end date, if Sieve date extension is available.
+* [jan] Allow to set vaction with only start or end date, if supported.
 * [jan] Add support for Sieve date extension to vacation messages (Request #12520).
 * [mjr] Export active vacation messages via the timeObjects API (Request #10885).
 * [mms] Added a NoSQL (MongoDB) driver for the storage backend.
@@ -1779,7 +1779,7 @@
    </stability>
    <license uri="http://www.horde.org/licenses/apache">ASL</license>
    <notes>
-* [jan] Allow to set vaction with only start or end date, if Sieve date extension is available.
+* [jan] Allow to set vaction with only start or end date, if supported.
 * [jan] Add support for Sieve date extension to vacation messages (Request #12520).
 * [mjr] Export active vacation messages via the timeObjects API (Request #10885).
 * [mms] Added a NoSQL (MongoDB) driver for the storage backend.