[exim] Exim mime problem

Hi

I am trying to log

$mime_content_transfer_encoding

in an exim filter file and also from a perl script i used embedded in
exim. All other, non "mime*" are working but all these are empty

       $mimecontenttransferencoding =
Exim::expand_string('$mime_content_transfer_encoding');
       $mimecontenttype                       =
Exim::expand_string('$mime_content_type');
       $mimecontentdisposition          =
Exim::expand_string('$mime_content_disposition');
       $mimecontentid                          =
Exim::expand_string('$mime_content_id');

Do i need to enable something in the exim config for this to work?



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