diff --git a/library/Zend/Mail/Protocol/Imap.php b/library/Zend/Mail/Protocol/Imap.php
index 90cc258..5c3dc9c 100644
--- a/library/Zend/Mail/Protocol/Imap.php
+++ b/library/Zend/Mail/Protocol/Imap.php
@@ -557,7 +557,7 @@ class Zend_Mail_Protocol_Imap
      *
      * @param  string|array $items items to fetch from message(s) as string (if only one item)
      *                             or array of strings
-     * @param  int          $from  message for items or start message if $to !== null
+     * @param  int|array    $from  message for items or start message if $to !== null
      * @param  int|null     $to    if null only one message ($from) is fetched, else it's the
      *                             last message, INF means last message avaible
      * @return string|array if only one item of one message is fetched it's returned as string
@@ -668,7 +668,7 @@ class Zend_Mail_Protocol_Imap
      * set flags
      *
      * @param  array       $flags  flags to set, add or remove - see $mode
-     * @param  int         $from   message for items or start message if $to !== null
+     * @param  int|array   $from   message for items or start message if $to !== null
      * @param  int|null    $to     if null only one message ($from) is fetched, else it's the
      *                             last message, INF means last message avaible
      * @param  string|null $mode   '+' to add flags, '-' to remove flags, everything else sets the flags as given
@@ -687,9 +687,14 @@ class Zend_Mail_Protocol_Imap
         }
 
         $flags = $this->escapeList($flags);
-        $set = (int)$from;
-        if ($to != null) {
-            $set .= ':' . ($to == INF ? '*' : (int)$to);
+        if (is_array($from)) {
+            $set = implode(',', $from);
+        } else if ($to === null) {
+            $set = (int)$from;
+        } else if ($to === INF) {
+            $set = (int)$from . ':*';
+        } else {
+            $set = (int)$from . ':' . (int)$to;
         }
 
         $result = $this->requestAndResponse('STORE', array($set, $item, $flags), $silent);