[Exim] How to create MIME headers from a filter file's mail …

Hi,

I am using the following filter file:

# exim filter <== this is needed!

if personal then
  mail expand file $home/autoresponse
       from postmaster <postmaster@???>
       cc $local_part@???
       log $home/autoresponse.log
       once $home/autoresponse.once
       once_repeat 3d
       return message
endif

deliver $local_part@???

However, I am German, and I would like to use Umlauts in my autoreply.
To be able to do so, I'd need the following set of _headers_ inserted
into my autoreply:

Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit

How do I do this from my forward file?

Greetings
Marc

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