There was something like sendmail on NT, but recently it has be renamed to IndigoMail. I think you can use it from perl like sendmail (although I've never tried it yet).

A tool I like to use is Blat which runs rather good under WinNT/2k/XP and also offers an easy way to send attachments. It's usage is similar to sendmail, only the parameters are slightly different.

Best regards,
perl -le "s==*F=e=>y~\*martinF~stronat~=>s~[^\w]~~g=>chop,print"