[exim] autoreply and non-7bit-ascii mailbody ?

Hi!

I try to send out some autoreply using the following filter:

if personal and
   $message_headers does not contain "X-Spam-Flag:"
  then
  mail
    to $reply_address
    from $local_part@$domain
    subject "Re: $h_subject:"
    file somedir/$local_part.AutoReply
endif

The file might contain some user-specific encoding (ISO 8859-1
or UTF8 or something else). Is there a simple way to detect and add
the proper MIME headers needed to properly encode the reply ?

-- 
pi@???            +49 171 3101372                         4 years to go !