Roundcube make me open relay :(

[kazabe]

Hi.

Im detecting that in my roundcube logs:

[21-May-2009 08:37:54 -0500]: User valid.user@localhost [75.126.32.187]; Message for undisclosed-recipients:;; 250: 2.0.0 Ok: queued as C8E55A4844B
[21-May-2009 08:39:57 -0500]: User valid.user@localhost [75.126.32.187]; Message for undisclosed-recipients:;; 250: 2.0.0 Ok: queued as 6E164A4844B
[21-May-2009 08:41:50 -0500]: User valid.user@localhost [75.126.32.187]; Message for undisclosed-recipients:;; 250: 2.0.0 Ok: queued as 10310A48445
[21-May-2009 08:43:28 -0500]: User valid.user@localhost [75.126.32.187]; Message for undisclosed-recipients:;; 250: 2.0.0 Ok: queued as 5802DA4844B
[21-May-2009 08:45:13 -0500]: User valid.user@localhost [75.126.32.187]; Message for undisclosed-recipients:;; 250: 2.0.0 Ok: queued as 116F8A4844D
[21-May-2009 08:46:57 -0500]: User valid.user@localhost [75.126.32.187]; Message for undisclosed-recipients:;; 250: 2.0.0 Ok: queued as DCCA5A4844D
[21-May-2009 08:47:57 -0500]: User valid.user@localhost [75.126.32.187]; Message for undisclosed-recipients:;; 250: 2.0.0 Ok: queued as B4C10A4844C

All that are spam.

I dont have relation with that IP address.

I only permit send my using auth, but this problem is very recurrent.
How can i prevent that?

Im using Roundcube v0.2.2

thanks

[kazabe]

problem solved.

the problem was password stolen.

thanks a lot.