try print $msg->as_string; instead of using the mail client. Your approach als shows up with a "Content-Type: multipart/mixed", and I believe that's what the OP didn't want.

The answer is, MIME::Lite is as documented, well suited to do either the "multipart/mixed" or a single content mail message. For other usages, use a different module.

Well, there is more documentation in MIME::Lite about accessor methods, so you can virtually put anything into your mail message. But why use MIME::Lite for that purpose?

Cheers, Sören