diff -ru typo3_src_4.4_dev/typo3/sysext/felogin/pi1/class.tx_felogin_pi1.php typo3_src-4.4.6/typo3/sysext/felogin/pi1/class.tx_felogin_pi1.php
--- typo3_src_4.4_dev/typo3/sysext/felogin/pi1/class.tx_felogin_pi1.php	2011-01-06 10:05:55.000000000 +0100
+++ typo3_src-4.4.6/typo3/sysext/felogin/pi1/class.tx_felogin_pi1.php	2011-01-06 10:03:41.000000000 +0100
@@ -368,7 +368,11 @@
 			$this->prefixId . '[user]' => $user['uid'],
 			$this->prefixId . '[forgothash]' => $randHash
 		));
-
+		$link = preg_replace(
+			array('/\[/', '/\]/'),
+			array('%5B', '%5D'),
+			$link 
+		);    
 		$msg = sprintf($this->pi_getLL('ll_forgot_validate_reset_password', '', 0), $user['username'], $link, $validEndString);
 
 			// no RDCT - Links for security reasons