[horde] Hook functions

[Jorge Minassian]

Hi !,

Could you please give some ad, or where read from, info about how to use 
hooks funtions ?.

My problem is with "passwd" module, it takes off "@domain.tld" part of 
username, when horde actually autenticates via IMP users using 
user at domain.tld with no problem.

I tried to find something on the list refering this module but I have no 
success.

I will apreciate any help ...

Thank you very much,
Jorge.