Redmine

Hi all

I have just installed Redmine and all is working great but incoming emails.
Emails are correctly redirected by postfix to the handler command, but issues are not added to a test project.
The production log shows:

Processing MailHandlerController#index (for xxx.xxx.xxx.xxx at 2009-12-01 15:49:09) [POST]
Session ID: 86200a32fdf604f983976457328996dc
Parameters: {"action"=>"index", "allow_override"=>"", "issue"=>{"project"=>"helpdesk"}, "controller"=>"mail_handler", "key"=>"xxxxxxxxxxxxxx", "email"=>"From xxxx@xxxx.xxx Tue Dec 1 15:49:06 2009\nReturn-Path: <xxxx@xxxx.xxx>\nX-Original-To: xxxx@xxxx.xxx\nDelivered-To: xxxx@xxxx.xxx\nMIME-Version: 1.0\nDate: Tue, 1 Dec 2009 15:49:06 +0000\nX-Google-Sender-Auth: xxxxxxx\nSubject: test\nFrom: xxx <xxxx@xxxx.xxx>\nTo: xxxx@xxxx.xxx\nContent-Type: multipart/alternative; boundary=001485f0ac64b4067c0479acb274\nMessage-Id: <20091201154906.B21AD5A12E@xxxx.xxx>\n\n--001485f0ac64b4067c0479acb274\nContent-Type: text/plain; charset=ISO-8859-1\n\n17\n\n--001485f0ac64b4067c0479acb274\nContent-Type: text/html; charset=ISO-8859-1\n\n17\n\n--001485f0ac64b4067c0479acb274--\n"}
Completed in 0.15118 (115 reqs/sec) | Rendering: 0.00037 (0%) | DB: 0.00152 (1%) | 422 Unprocessable Entity [http://xxxx.xxx/mail_handler]

Any help greatly appreciated.
Thanks in advance
Vito