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/usr/share/doc/postfixadmin/DOCUMENTS/HORDE.txt is in postfixadmin 2.3.5-3.

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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.