>The "lightest" way I've found is to use Rick Strahl's wwipstuff. It will even let you give a bogus email name if you want to send email that can't be replied to. Check it out at www.west-wind.com

But wwIPStuff won't let the user look at the mail in his mail program- it's all low level SMTP. You could, of course, build your own e-mail creation form and use wwIPStuff to send the mail, but that might be overkill in this case.