Mime mail header incorrect when sended with roundcube

[techside]

Hi, we use RoundCube beta2 and we have the problem that
when we compose mail message with roundcube it arrive with
mime header incorrect:

MIME-Version: 1.0\r\nDate: Thu, 12 Oct 2006 11:51:44 +0200\r\nFrom: xxx \r\nTo: [email protected]\r\nSubject: test\r\nMessage-ID: <[email protected]>\r\nX-Sender: [email protected]\r\nUser-Agent: RoundCube Webmail/0.1b\r\nContent-Type: text/plain; charset="UTF-8"\r\nContent-Transfer-Encoding: 8bit\r\n
Message-Id: <[email protected]>

So if we show the source of the message the enf of line characters is displayed!!
This happens when read mail with many mail client (Thunderbird, RoundCube) .
With beta1 there was no problem, the configuration of the server is the same.

We use courier-imap + postfix as the mail server.

Any suggestions ?
Thanks.
Fabio.