Travis,
>Good to hear from you. Been a while, huh?
Yep. Hope all is well with you these days. How is the book project coming along?
>Anyway, your answer is in line with everyone else's that I've gotten which is basically: you can't do it. Putting their email address in the Cc property gives me the same error.
I just checked IPWorks! for .NET from nSoftware (an advertiser in CoDe) and their SMTP emailer DOES support a Reply-To address in addition to the From address, and you can download a free trial version:
http://www.nsoftware.com/products/controls/?ctl=SMTP&prod=ipworksMaybe that will do the trick for you by putting your address in the From and their address in the Reply-To as well as CC.