[horde] Different login to dovecot than general login

[Holger A. Brinkhaus]

Hi,

Currently I want to move from SOGo to Horde.

I have the following configuration:
Authorization is checked by "pure" userid (without @domain.tld) through 
Active Directory. This works fine.

For Dovecot I need (because of the usage of virtual domains) the login 
by mail address. Dovecot accepts also pure user for login but leads to 
wrong mailbox.

In the IMP backends.local.php  hordeauth is set to full:

$servers['imap'] = array(
    // ENABLED by default; will connect to IMAP port on local server
    'disabled' => false,
    'name' => 'IMAP Server',
    'hostspec' => 'localhost',
    'hordeauth' => full,
    'protocol' => 'imap',
    'port' => 143,
    'secure' => 'tls',
    'debug' => '/tmp/hordeimap.log'
);

I already tried to manipulate userid by horde hook with 
postauthenticate. This works principally  (approved by logging) but I 
get the message for IMP that this user cannot log in. When I (in this 
case) log into webmail manually with the exact credentials which has 
been set in the hook I got connected to right mailbox...

Do you have any suggestions for me?

Best regards
   Holger