dovecot - Nov 2010 - 2.0.7 (0757f4f5b882): LMTP Server refuses queued mail

Hi,

not sure what is wrong with the mail, but the Dovecot LMTP won't accept it. 
This is actually the first ever occurrence, so I'm attaching the evidence
for further diagnosis:

[?]
Nov 26 18:01:49 spectre dkim-filter[1723]: A7BEA4086: no signature data
Nov 26 18:01:49 spectre postfix/qmgr[6175]: A7BEA4086:
from=<bounce-1841919-268661 at news.juno.co.uk>, size=131577, nrcpt=1
(queue active)
[?]
Nov 26 18:01:49 spectre postfix/lmtp[27788]: 19FB54088: to=<tlx at
leuxner.net>, relay=spectre.leuxner.net[private/dovecot-lmtp], delay=0.27,
delays=0.25/0/0/0.01, dsn=4.3.0, status=deferred (host spectre.leuxner
.net[private/dovecot-lmtp] said: 451 4.3.0 Temporary internal failure (in reply
to end of DATA command))

$ mailq
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
19FB54088    131807 Fri Nov 26 18:01:49  bounce-1841919-268661 at
news.juno.co.uk
(host spectre.leuxner.net[private/dovecot-lmtp] said: 451 4.3.0 Temporary
internal failure (in reply to end of DATA command))
                                         tlx at leuxner.net

-- 129 Kbytes in 1 Request.

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Regards
Thomas

On 27.11.2010, at 13.49, Thomas Leuxner wrote:
> .net[private/dovecot-lmtp] said: 451 4.3.0 Temporary internal failure (in
reply to end of DATA command))
Nothing in Dovecot's log? Typically this should log an error.