Ufff... mml-attach-file does not seem to play well with notmuch. Old
style:

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Message-ID: <50C54786.4000308@riseup.net>
Date: Sun, 09 Dec 2012 23:23:02 -0300
From: hellekin <hellekin@riseup.net>
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:10.0.10) Gecko/20121028 Icedove/10.0.10
MIME-Version: 1.0
To: hellekin@cepheide.org
Subject: test HTML with Unicode
X-Enigmail-Version: 1.4.1
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

Lazy brown fox bla...
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Please forgive the mess,

==
hk