Hi,
i am using an ubuntu server (12.04), i have installed a postfix mail-server on top of it using this tutorial:
http://flurdy.com/docs/postfix/but thats just to give you the basics.
I did this a few months ago and had no problems since then, this includes roundcube.
But i just noticed that i cannot login to my mail account using roundcube anymore. I just get the message: "Login failed" (i use the germal localisation so basicaly the message is "Die Anmeldung ist Fehlgeschlagen").
But this is just a roundcube problem, because i can send and get new mails with thunderbird without problems!
The weird thing is, that i definetly did not changed anything on the server.