I have a problem. Now i am hosting my site on 1 server and want to transfer it to other. I transfer my site, but now i try to transfer and the mail server. I install mail server to new host from this steps:

But on IMAP settings i leave it blank. I test to send message from server and it is okay, but now i can't login to my roundcube mail and how to create when somebody send me a message to admin@oldhost.com to receive it on admin@newhost.com

I dump my roundcube db from old server and import it to the new server and try to login with same password but "Login failed"

Any ideas ?