BANNED contents from you (.exe,.exe-ms,ABC.EXE)

2011 年 4 月 7 日 – 6:06 PM

ABC.EXE入りの.ZIPファイルを添付したメールを送ろうとしたら、下記内容のアラートメールが届き、送信できなかった。
色々調べたら対策方法がわかった。(後述)

BANNED CONTENTS ALERT

Our content checker found
banned name: .exe,.exe-ms,ABC.EXE

in email presumably from you to the following recipient:
-> メールアドレス

Our internal reference code for your message is 21077-13/YMMacV4ed3Js

Return-Path: <メールアドレス>
From: = 名前 <メールアドレス>
Message-ID: <メッセージID>
Subject: = 表題

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.

■対処方法
/etc/amavisd.conf の以下の部分をコメントアウト。

@decoders = (
:
:
# [‘zip’, \&do_unzip],
# [‘lha’, \&do_lha, ‘lha’],
:
:

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