Problem with case sensitive login

[soupdiver]

Hey,
actually i have a strange problem with Roundcube and case sensitive user login...

I already red some threads about this and the fixes but my problem is not the same

Situation:
in postfix my mailaccount is:
[email protected]

when i login first time with this account in roundcube
a database entry (in my roundcube database) is created with the username i entered in the textbox... it is stored case sensitive.

When i try login later i  have to enter the name EXACTLY like the first login otherwise it fails.

my imap server is dovevot and dovecot doesnt care if i try to login with 'Manager' or 'manager'

Code Select Expand

Feb 15 16:29:47 XXX dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, TLS
Feb 15 16:29:47 XXX dovecot: IMAP([email protected]): Disconnected: Logged out bytes=241/848
Feb 15 16:29:51 XXX dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, TLS
Feb 15 16:29:51 XXX dovecot: IMAP([email protected]): Disconnected: Logged out bytes=29/399


how can i fix this issue? Oo

[JohnDoh]

in 0.5.1 and i think in 0.5 too but i'm not sure there is an option in the config to always lowercase usernames