I believe it's an issue related to how Bondware formats the actual mail message. There's a discussion (sort of) on it in the "help please - how to join renderosity?" thread started by firefly. I'll sum it up here and perhaps you can check into it since Jeff is apparently ignoring the issue. The "To:" header is not being sent in the actual body of the message. Depending on how a mail server is (mis)configured it may drop the message.