The version installed on my system originally was 5.08. If you are not running the 5.08 version to have source access, please upgrade to a very recent version. A recent version of Perl is required as demime makes heavy use of references and so forth. 98b has been tested of 5.00404 and 5.6.0. The tool currently runs on Linux.
Postfix does no conversion, and the top level conversions seem to work just fine.
If I discover other dependencies, I'll list them here. All of these packages were available from the CPAN Perl module archives . Install them in that order to avoid whining by the package managers. The current versions of these tools, as of March 2001, also work. However, they will require that you are root or equivalent.