Different password accepted

[gagou7]

Hi,

I have a problem, I use Postfix on my Debian server and I have all users in a mysql database. When I want to connect to my webmail with Roundcube, I can enter differents passwords and it's works.

The best example: Create a new user with this password "AbCdEfGhI_Z_", now test if you can log in Rouncube with a different password like "AbCdEfGhI_Z_1". With me it works and I do not know why !

Any idea why it's works?

Thank's