I've not used Mail::Mailer on NT but Mail::Sendmail works a treat (just make sure you set your smtp server). If you have Activestate's perl you can install it with PPM (just type ppm install Mail::Sendmail at a dos prompt). An example:

use Mail::Sendmail;
sendmail(To => $to, 
    From => $from, 
    Message => $msg,
    Subject => $subject,
    smtp => 'localhost') || die "Couldn't send email";
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gav^