Here are some code snippets you might find helpful, from stuff from work I wrote that I probably can't share in full:

         my $p= MIME::Parser->new;
         $p->output_to_core(1);
         $p->parse($msg_or_fh);
[download]

   # Find every MIME part which is not a container for other parts
   sub _leaf_parts {
      my @parts= $_->parts;
      @parts? ( map { _leaf_parts() } @parts ) : ( $_ )
   }
   my @leaf_parts= map { _leaf_parts() } $email;
[download]

   
   # Open a handle to each part which is an attachment
   my @attachments=
      map +{
         name => $_->head->recommended_filename,
         content_type => _decoded_mime_header($_->head, 'Content-Type'
+),
         handle => $_->bodyhandle->open('r'),
         mimepart => $_,
         email => $email
      },
      grep length($_->head->recommended_filename//''), @leaf_parts;

   # Convert zipfile attachments to the list of files within
   @attachments= map { $_->{name} =~ /\.zip$/? _extract_zipfile($_) : 
+($_) } @attachments;
[download]

# Takes one file info, and returns a list of file infos for each file 
+within the zip file.
# Since these are not directly MIME parts, they are simply:
#  {
#    name => $original_filename,
#    handle => $io_handle
#  }
sub _extract_zipfile {
   my ($file)= @_;
   my @files;
   my $zipfile= IO::Uncompress::Unzip->new($file->{handle})
      or die "Can't open zip file: $UnzipError";
   my $status;
   for ($status= 1; $status > 0; $status= $zipfile->nextStream()) {
      my $name= $zipfile->getHeaderInfo->{Name};
      $log->info("Extracting $name from zip file");
      my $tmp= File::Temp->new(TEMPLATE => 'email-zip-content-XXXXXXX'
+);
      my $buf;
      while (($status= $zipfile->read($buf)) > 0) {
         $tmp->print($buf) or die;
      }
      last if $status < 0;
      push @files, { name => $name, handle => $tmp };
   }
   die "Error processing zip file"
      if $status < 0;
   return @files;
}
[download]

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