You're seeing parts of the headers there.
If I remember correctly, you may (using this method) have to use print $$body[2] or something similar.
Please see perldata for more information on why.

Mime::Tools is not the most friendly of modules, either... Here's a small snippet which I used once upon a time. Mail messages are stored in @msgs, ok?

foreach my$thismsg (@msgs){
    my $parser = new MIME::Parser;

    my $ent = $parser->parse_data ("$thismsg");
    print "here's the message :\n$thismsg\n";
    print "mime type is ", $ent->mime_type(),"\n";
    my @all_parts  = $ent->parts;
    foreach (@all_parts) {
        print "mime type is ", $_->mime_type(),"\n";
        my $head=$_->head()->as_string;
        if ($head=~/filename\="(.*?)"/) {print "Filename is $1\n"}
        print "header is $head\n";
        print "------------------done\n";
    }
    print "------------------done with messages\n";

}
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This shows how to read the entire message, parts of the content type and the header. IIRC, to pull out the message body would be similar to my $body=$_->body()->as_string; rather than my $head=$_->head()->as_string;.