Horde integration with Postfixadmin This is taken from the following thread : https://sourceforge.net/forum/forum.php?thread_id=1869141&forum_id=676076 Namely : "Hi, people, I was wondering if anyone was using PA with Horde3. I want my users to be able to change teir password from inside Horde, so I was wondering if anyone has implemented a custom hook or defined a SQL query to make the password change possible. " Solution : "Hi, that works for me without any hook - with the SQL driver. I connect through IP to localhost. You can also try socket connection... my horde/passwd/config/backends.php looks like: $backends['sql'] = array ( 'name' => 'Mail SQL Server', 'preferred' => '', 'password policy' => array( 'minLength' => 3, 'maxLength' => 8, 'maxSpace' => 0, 'minUpper' => 1, 'minLower' => 1, 'minNumeric' => 1, 'minSymbols' => 1 ), 'driver' => 'sql', 'params' => array( 'phptype' => 'mysql', 'hostspec' => '127.0.0.1', 'port' => '3306', 'protocol' => 'tcp', 'username' => 'postfix', 'password' => 'yourpostfixdbpassword', 'encryption' => 'crypt-md5', 'database' => 'postfix', 'table' => 'mailbox', 'user_col' => 'username', 'pass_col' => 'password', 'show_encryption' => false ) ); " Thanks to 'Kope' for the solution, and of course Luis Hernán Otegui (slimshady76) for asking the question.