How to send emails from an address without logging into the server

I'm building an asp.net application for a client that requires a c开发者_JAVA百科onfirmation email to be sent. I've gotten the code working but the only problem is that I can't get the code to work with their web host (godaddy). Is there a way to send emails with the from address marked as the clients' without having to use godaddy? (essentially faking it)

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Be careful or you'll lose your emails to spam filters.

Specifically, see the Reverse PTR record discussion here:

http://www.codinghorror.com/blog/2010/04/so-youd-like-to-send-some-email-through-code.html