roundcube mails not reachning from mail server

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The mails can be send from roundcube

 The mails reach the server successfully. But they do not reach roundcube

 What can i do?

 [21-Jun-2011 15:03:32 -0500]: IMAP Error: Authentication for
 roundcube_test fail                                             ed
 (LOGIN): "a001 NO Authentication failed." (POST
 /rcm/?_task=&_action=login)
 [21-Jun-2011 15:15:10 -0500]: IMAP Error: Empty password (POST
 /rcm/?_task=&_act                                             ion=login)


which file has to be configured

i have exim, roundcube and dovecot?

[SKaero]

RoundCube is just a mail client so your problem is with exim or dovecot.