Inline Text Signature and attachment-only mail

[Knutzen, Heinz]

Hi,

yesterday I went into production with MailScanner-3.23-5 for about 500 users
and got only a few complaints.

One user received a mail with an empty body and two text/plain attachments.
Mailscanner inserted the "Inline Text Signature" into the first attachment.
The user got some trouble from this, because the attachment was used as
input for some program
which disliked the signature.

I could reproduce this behaviour; see below for an example message.

MailScanner uses SignCleanMessage to insert the signature into the first
part of a multipart message.

MailScanner shouldn't insert a signature into an attachment which is marked
with
        Content-Disposition: attachment; filename="something.txt"

Viele Grüße

-- Heinz Knutzen

Datenzentrale Schleswig-Holstein
Altenholzer Str. 10-14, 24161 Altenholz, Germany
http://www.dzsh.de/
mailto:heinz.knutzen at dzsh.de
Tel: +49.431.3295.581 Fax: +49.431.3295.410 

Example:

MIME-Version: 1.0
Content-Type: multipart/mixed;
        boundary="----=_NextPart_000_0008_01C26FB5.E9EB2260"

This is a multi-part message in MIME format.

------=_NextPart_000_0008_01C26FB5.E9EB2260
Content-Type: text/plain;
        name="test1.txt"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment;
        filename="test1.txt"

Test 1
<<<--- Signature is inserted here

------=_NextPart_000_0008_01C26FB5.E9EB2260
Content-Type: text/plain;
        name="test2.txt"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment;
        filename="test2.txt"

Test 2

------=_NextPart_000_0008_01C26FB5.E9EB2260--