If you approach a problem that's not already solved in the core of perl, go to http://search.cpan.org/ and see if there's a module that does what you want. MIME::Lite is often recommended.

That said, sending emails without configuration may work, but many spam protection measures will reject it.

The bare minimum you should have is a proper From-address, and having a DNS entry for that domain that points to the IP of the machine where you send the mail from.

Or even better, use an account on a mail server that is maintained by somebody who knows his job.