I´m triyin to configure a little application with the West Wind classes. It seems so easy to build... but I´m geting an error trying to send mails:

501 Invalid domain name

Domain names are ok, I was trying with 3 diferent mail servers, 2 of my own and one of my IPS, with no restrictions, and have the same result, and even using the demo apps get the same error. I´m using a shareware version and it´s important to me to build a demo app to convince my boss to buy me the complete version... any idea about what could be wrong? Are there a diferent option to build mail and web app easily?

Thanks in advance!