[imp] Translating alias ...

[Roberto Moraes]

    Hi there,

    I'm trying to customize Horder (Imp) to our mail server, but i'm 
having trouble to find a way to make it autenticate the user, let me 
explain: our pop3 server has sequencial names as users, somethins like 
"usr0001", or "client108745", so we work with the "alias" idea, to 
provide a friendly and easier name this users, and this 'alias' is 
stores in a database, so, what i must to do; i have to get the user 
'alias'  on the form that send it to the server 
('HORDE_BASE/horde/imp/templates/login/login.inc'), and pass it throug a 
page that 'translate' this alias, and re-send by the 'header' function 
to the original page that the form is searchin' 
('HORDE_BASE/horde/imp/redirect.php'); but it always says that 'Login 
failed for some reason. Most likely your username or password was 
entered incorrectly.'
Anyone knows what i'm doin' wrong ?, i was thinkin about session 
problems, but i do nothing with the current session in the page that i 
get the values from the form, i just list them, and substitute the 
"my_username", for the "user187523", so, i'm completely lost now ..
   Any ideia of what i'm doin' wrong ?, can somebody help-me .. ?, thanx 
in advance.

   Roberto Moraes