I can't get to see the error message on my machine(I tried removing the other Mime's..) But I think you might have to set the flag BEFORE requiring the module.

$MIME::Lite::PARANOID = 1;
require MIME::Lite;
[download]

(ViM: dd->p;) I don't know if it will work, nor I can't test it, but I think it worth a try.