Have you checked the documentation at the following site?:
http://www.net-shopper.co.uk/utilities/MailToR.htm
We're using it on IIS 4.0 (also used it on 3.0) and the only problems I
occasionally see is that mailto.exe didn't respond in a reasonable amount
of time, so it stops the process or something.
Josh Hillman
hillman@talstar.com