У меня стоит почтовый сервер postfix, с включенной проверкой на вирусы при помощи amavis и clamav

Все работает нормально

Но вот сегодня при попытке отправить архив  мне вышло сообщение

-----Original Message-----
From: Content-filter at server2.obj.ru [mailto:postmaster@server2.obj.ru]
Sent: Thursday, April 16, 2009 9:29 AM
To: kda@obj.ru
Subject: BANNED message from you (multipart/mixed | application/octet-stream,.zip,=?koi8-r?B?y8HUwczPxy56aXA=?=,ËÁÔÁÌÏÇ.zip | .exe,.exe-ms,MosBuild2009.exe)

BANNED CONTENTS ALERT

Our content checker found
    banned name: multipart/mixed |
      application/octet-stream,.zip,=?koi8-r?B?y8HUwczPxy56aXA=?=,ËÁÔÁÌÏÇ.zip
      | .exe,.exe-ms,MosBuild2009.exe

in email presumably from you <kda@obj.ru>
to the following recipient:
-> lup@mmt.ru

Our internal reference code for your message is 29937-15/0AeSb4st-OXM

First upstream SMTP client IP address: [192.168.0.27] E154-1
According to a 'Received:' trace, the message originated at: [192.168.0.27],
  e1542 E154-1 [192.168.0.27]

Return-Path: <kda@obj.ru>
Message-ID: <20090416052918.BE3E57387@server2.obj.ru>
Subject: =?koi8-r?B?79TQ0sHXy8E6IMvB1MHMz8c=?=

Delivery of the email was stopped!

The message has been blocked because it contains a component
(as a MIME part or nested within) with declared name
or MIME type or contents type violating our access policy.

To transfer contents that may be considered risky or unwanted
by site policies, or simply too large for mailing, please consider
publishing your content on the web, and only sending an URL of the
document to the recipient.

Depending on the recipient and sender site policies, with a little
effort it might still be possible to send any contents (including
viruses) using one of the following methods:

- encrypted using pgp, gpg or other encryption methods;

- wrapped in a password-protected or scrambled container or archive
  (e.g.: zip -e, arj -g, arc g, rar -p, or other methods)

Note that if the contents is not intended to be secret, the
encryption key or password may be included in the same message
for recipient's convenience.

We are sorry for inconvenience if the contents was not malicious.

The purpose of these restrictions is to cut the most common propagation
methods used by viruses and other malware. These often exploit automatic
mechanisms and security holes in more popular mail readers (Microsoft
mail readers and browsers are a common target). By requiring an explicit
and decisive action from the recipient to decode mail, the danger of
automatic malware propagation is largely reduced.

Я поискал в инете - похоже дело в том что он не может проверить раровский архив 3й внрсии рара - хотя я в этом и не уверен :( Буду благодарен если кто то читающий эту тему подтвердит или опровергнет мое мнение.

Второй вопрос - а как лучше все включить проверку таких архивов или наоборот отключить именно их проверку но так что бы письма содержащие их проходили.