Content-Type: text/plain; charset=unknown-8bit after adding footer

[Leif Neland]

After using MailScanner to add an advert at the bottom of each message "this
message is scanned for spam and virus by..."
some recipients gets a message saying the message can't be read because it
is in a non-supported charset, and one should save the attached message and
read it in an editor which supports the charset. (I won't quote the message
because it is in danish...)

Can I somehow make sendmail pretend the message is in iso-8859-1 if not
listed otherwise?

The mangled message has these lines in the header.

Content-Type: text/plain;     charset=unknown-8bit
Content-Transfer-Encoding: quoted-printable
X-MIME-Autoconverted: from 8bit to quoted-printable by ...

I've asked the same in comp.mail.sendmail.

Leif

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