Invoke internal mail extension

Hi,

I have searched for days on internet for information on how to invoke
the internal mail extension from CVSNT.
If I add a line to the notify file

ALL mail %s

I get a scripting error, and no email. When I add a line to the
notify_email file

DEFAULT mail_tpl_01

And have a mail_tpl_01 file with a mailing template I can get an email
sent --but--
in the template I MUST (!) set a TO address while I only want the
watchers of a file
to be mailed, not a fixed email address.

Anyone who has CVSNT (on windows) having send out notification emails
with
the internal mail extension of CVSNT ? and willing to share how its is
setup ?

thanks