syslog lowercase in domain part of Message-Id

[Marco]

Hello,

  I noticed that Amavisd 2.10.1 lowercases the domain part of  
Message-Id in logs.

For instance see at this example:

2015-11-18T15:20:46.250700+01:00 host postfix/smtpd[10067]:  
3p15sB1mdLzFpW3: client=my.example.org[10.10.10.168]
2015-11-18T15:21:14.704192+01:00 host postfix/cleanup[10000]:  
3p15sB1mdLzFpW3: message-id=<dskjfsdlkfjslkDFDFSF at gMail.coM>
2015-11-18T15:21:15.073639+01:00 host postfix/qmgr[11106]:  
3p15sB1mdLzFpW3: from=<postmaster at example.org>, size=313, nrcpt=1  
(queue active)
2015-11-18T15:21:16.032231+01:00 host postfix/lmtp[10177]:  
3p15sB1mdLzFpW3: to=<me at example.org>,  
relay=127.0.0.1[127.0.0.1]:20024, delay=43, delays=42/0/0.04/0.91,  
dsn=2.6.0, status=sent (250 2.6.0 <me at example.org> Message accepted  
for delivery)
2015-11-18T15:21:16.032538+01:00 host postfix/qmgr[11106]:  
3p15sB1mdLzFpW3: removed
2015-11-18T15:21:16.020006+01:00 host amavis[10103]: (10103-07) Passed  
SPAMMY {RelayedTaggedInbound}, [127.0.0.1] [10.10.10.168]  
<postmaster at example.org> -> <me at example.org>, Message-ID:  
<dskjfsdlkfjslkDFDFSF at gmail.com>, mail_id: wFMEnpSkkuTV, Hits: 6.078,  
size: 1391, queued_as: 3p15sl74zczFpW4, 426 ms

This could be a problem in log searching. Is there a  
patch/configuration option to avoid the case conversion?

Thank you very much
Best Regards
Marco