somitimes occur Blocked BANNED

[Usuário do Sistema]

Hello, I'm with a problem very strange that a bit defficult explain
it...but go ahead.

sometimes my anti-spam blocks some message send from user to other out
of the my domain. the problem occur from this user
hernan.gallo at tigre.com to vguajardo at tigre.com.ar

they are in different domain and MTA server. the more strange is that
block happens sometime and no always.


the user hanan.gallo at tigre.com is allow to send any message with any
file attached at the side my anti-spam server as well as vguajardo is
in a whitelist.

but sometimes hanan.gallo at tigre.com that uses Microsoft Outlook 2007
sends a message even without attached file to vguajardo at tigre.com.ar
and the anti-spam ( from my domain tigre.com ) blocks as log bellow.


Aug 30 17:07:36 tgadml0003 amavis[13219]: (13219-06-14) Blocked BANNED
(application/x-dosexec,.exe,.exe-ms,regedit.exe), [128.2.8.73]
[190.128.173.98] <hernan.gallo at tigre.com> -> <vguajardo at tigre.com.ar>,
quarantine: quarentena at tigre.local, Message-ID:
<20110830170732.10197hscaty4roxw at webmail.tigre.com>, mail_id:
eS2iXErEmZ95, Hits: -, size: 546324, 2930 ms
Aug 30 17:07:36 tgadml0003 amavis[13219]: (13219-06-14) Blocked BANNED
(application/x-dosexec,.exe,.exe-ms,regedit.exe),
<hernan.gallo at tigre.com> -> <vguajardo at tigre.com.ar>, Hits: -, tag=3,
tag2=6.3, kill=6.3, 0/0/0/0


packages version

clamav-0.96.1-1.el5.rf
amavisd-new-2.6.4-2.el5.rf
amavisd-new-milter-2.6.4-2.el5.rf
clamav-db-0.96.1-1.el5.rf

I'dont know very well of the amavis or the anti-spam...so any tip is
very welcome


thanks