I am sorry - these forums are for user to user communications and chit-chat - and real support questions should always go to
Support@ChangeIP.com.
However, let me address this here since many others will benefit from it as well.
I believe in the Outbound Security tab on your exchange setup you would specify Basic Authentication and use your relay accounts email address as the user and the password for that mailbox. This should allow Exchange to send mail to our servers for relaying using SMTP Auth.
Let me know what happens.
Thanks,
Sam