Hylafax and Kolab: Undelivered Mail Returned to Sender

[Alessio Cecchi]

I have setup kolab to work with hylafax, but somte times i get this error:

> -----Messaggio originale-----
> Da: Mail Delivery System [mailto:MAILER-DAEMON at domain.com] 
> Inviato: lunedì 25 luglio 2005 15.59
> A: fax at domain.com
> Oggetto: Undelivered Mail Returned to Sender
> 
> 
> This is the Postfix program at host mail.domain.com.
> 
> I'm sorry to have to inform you that your message could not be be delivered
> to one or more recipients. It's attached below.
> 
> For further assistance, please send mail to <postmaster>
> 
> If you do so, please include this problem report. You can delete your own
> text from the attached returned message.
> 
> 			The Postfix program
> 
> <faxmaster at domain.com>: service unavailable. Command output: Failed to set
>     recipient: Invalid response code received from server, code 550
> 
> 
> ------------------------------------------------------------------------
> 
> Reporting-MTA: dns; mail.domain.com
> X-Postfix-Queue-ID: 159B21D5800F
> X-Postfix-Sender: rfc822; fax at domain.com
> Arrival-Date: Mon, 25 Jul 2005 15:58:34 +0200 (CEST)
> 
> Final-Recipient: rfc822; faxmaster at domain.com
> Action: failed
> Status: 5.0.0
> Diagnostic-Code: X-Postfix; service unavailable. Command output: Failed to set
>     recipient: Invalid response code received from server, code 550
> 
> 
> ------------------------------------------------------------------------
> 
> Oggetto:
> Facsimile received from 06225800
> Da:
> "The HylaFAX Receive Agent" <fax at domain.com>
> Data:
> Mon, 25 Jul 2005 15:58:33 +0200
> A:
> <FaxMaster at domain.com>
> 
> A:
> <FaxMaster at domain.com>
> 
> 
> recvq/fax00285.tif (ftp://server:4559/recvq/fax00285.tif):
>     Sender: 06225800
>      Pages: 1
>    Quality: Normal
>       Page: 1728 by 392
>   Received: 2005:07:25 15:58:09
> TimeToRecv: 0:22
> SignalRate: 14400 bit/s
> DataFormat: 2-D MR
> ReceivedOn: ttyS0
>     CommID: c00000284 (ftp://server:4559/log/c00000284)
> 
> The facsimile was automatically dispatched to: fax at domain.com.
> 

What means?
Thanks
-- 
Alessio Cecchi ++ www.skye.it