I'm inclined to think that Net::SMTP is perhaps a bit overkill here for what you're trying to achieve (I haven't studied the according documentation extensively and don't know your exact intentions, so I may be wrong -- from what I understand, it lets you interface the SMTP server directly as if you would telnet to it on the port the SMTP service is listening to and set off your commands (that doesn't necessarily imply that the entire SMTP subset of understood commands is implemented in Net::SMTP)).

You may have a look at Mail::Sendmail, which is in my opinion much more user-friendly, but also a bit more limited (perhaps sufficient for your needs).

As it seems you're worrying about not installing extra packages (or are not permitted to do so), you could 'simply' use lib in combination with Mail::Sendmail.

Update: mention of lib