Corion said: "Of course, you can still simply copy MIME::Lite into your script, no matter how much reluctance you show.", as well as having told this to you in the CB before you posted your question.

You seem to either be ignoring this advice or you don't understand what you have repeatedly been told. MIME::Lite is not a core module, so you are going to have to:

A) Install it (see the Installing Modules from the tutorials section of this site)
B) Do as you have been told and use the source of MIME::Lite within your own script.

Martin