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Date:      Thu, 24 Mar 2016 07:42:09 +0000
From:      krad <kraduk@gmail.com>
To:        Olivier Nicole <Olivier.Nicole@cs.ait.ac.th>
Cc:        Matthew Seaman <matthew@freebsd.org>, FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: [Phishing]Re: Anti-virus for FreeBSD
Message-ID:  <CALfReydnyRqhqih-xYKba5BcqXSfN98MGBcZB+a0Vvr1j8Jc2w@mail.gmail.com>
In-Reply-To: <wu7a8lozdms.fsf@banyan.cs.ait.ac.th>
References:  <56F2CC22.9090500@FreeBSD.org> <wu7a8lozdms.fsf@banyan.cs.ait.ac.th>

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But a picture can contain a 1000 words, and it also engages different areas
of the brain. However is an email a place for pictures? One can easily link
to something, and thus side step the whole issue.

On 24 March 2016 at 04:46, Olivier Nicole <Olivier.Nicole@cs.ait.ac.th>
wrote:

> Matthew,
>
> > It is not possible a priori to strip out any file belonging to some
> > arbitrary application which implements some sort of embedded macro
> > language, let alone tell if any such file actually contains any
> > executable bits.
>
> If you know the format of the file, I believe you can scan it and find
> if it contains macro. It's time consuuming and implies you have a large
> knowledge of what every file looks like. Anti virus do that.
>
> > This is essentially the approach taken on these (FreeBSD) mailing lists,
> > except here, it's reversed: all attachements are removed, except for a
> > certain number of known-harmless ones, like PGP-Mime signatures or some
> > simple text formats.
>
> I think one of the reason, beside security, is to keep the list lean: if
> you allow attachements, you quickly end up with email send in the form
> of Words documents...
>
> If you cannot explain your problem using plain ASCII only, then you have
> to rethink what you are trying to explain first :)
>
> best regards,
>
> olivier
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