[imp] syntaxe of blacklist configuration in prefs.php

[Helene Figueiredo]

Hi all,

We have installing horde/imp/ingo on a serveur with :

Version of imp is : imp-h3-4.1.2
Version of horde is : 3.1.4
Version of ingo is : h3-1.1.3
Version of turba is : 2.1.4
Version of php : 5.2.4

My question is about ingo and the configuration of the blacklist. Anyone 
have any idea of the signification of this parameters in the file 
prefs.php of ingo about filter rules ?

I'd like to understand the syntaxe for $_prefs['blacklist'], specialy 
for 'a:2:{s:1:"a";a:0:{}s:1:"f";s:0:"";}'.

// filter rules
$_prefs['rules'] = array(
     'value' => 
'a:4:{i:0;a:2:{s:4:"name";s:9:"Whitelist";s:6:"action";i:' . 
INGO_STORAGE_ACTION_WHITELIST . ';}i:1;a:3:{s:
4:"name";s:8:"Vacation";s:6:"action";i:' . INGO_STORAGE_ACTION_VACATION 
. ';s:7:"disable";b:1;}i:2;a:2:{s:4:"name";s:9:"Bl
acklist";s:6:"action";i:' . INGO_STORAGE_ACTION_BLACKLIST . 
';}i:3;a:2:{s:4:"name";s:7:"Forward";s:6:"action";i:' . INGO_S
TORAGE_ACTION_FORWARD . ';}}',
     'locked' => false,
     'shared' => false,
     'type' => 'implicit'
);

// blacklist
$_prefs['blacklist'] = array(
     'value' => 'a:2:{s:1:"a";a:0:{}s:1:"f";s:0:"";}',
     'locked' => false,
     'shared' => false,
     'type' => 'implicit'


Thanks for your help.

Helene
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