mail disapears in the postfix queue

[s66576 at alice.it]

Hi, 

this strange thing happens on my local linux server, it's a simple installation of Mailscanner + postfix on ubuntu lts:

Jan 10 10:39:42 pluto postfix/smtpd[21677]: F19BD354E2: client=r.retail.telecomitalia.it[79.41.XXX.XXX], sasl_method=LOGIN, sasl_username=smtpuser at XXX.com
Jan 10 10:39:43 pluto postfix/cleanup[24467]: F19BD354E2: hold: header Received: from E4300 (XXX.41-79-r.retail.telecomitalia.it [79.41.XXX.XXX])??by XXX.XXX.it(Postfix) with ESMTPA id F19BD354E2??for <Ettore.XXX at XXX.com>; Sun, 10 Jan 2010 10:3 from -r.retail.telecomitalia.it[79.41.XXX.XXX]; from=<XXX at XXX.com> to=<Ettore.XXX at XXX.com> proto=ESMTP helo=<E4300>
Jan 10 10:39:43 pluto postfix/cleanup[24467]: F19BD354E2: message-id=<3DCE4D546BD8463BABBE1DC13DBD0390 at E4300>

After this I don't see any trace of this queueid  F19BD354E2 in my mail.log, that's the first time happen to me. No message was wrote on filesystem, and the postfix queues are empty ( hold,deferred... ). Should I try to increase Mailscanner log verbosity ? Or is better look for postfix queue ? 
Mailscanner fetches mails from hold and leave them incoming, it's a default installation. 
Anyone with similar problems ?
Regards.
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