The error you posted is from an Exchange server and the message was rejected by Google.
Did you sign up for GoDaddy's hosted Exchange service?
Are you sure that you entered the correct email address?
As I said, the error means what it says - the NDR says the user doesn't exist.
The domain name you have entered "mischlerandnurre.com " has MX records that are pointing at Google.
C:\>nslookup
Default Server: Server: server.domain.co.uk
Address: 192.168.3.2
> set type=mx
> mischlerandnurre.com
Server: server.domain.co.uk
Address: 192.168.3.2
Non-authoritative answer:
mischlerandnurre.com MX preference = 5, mail exchanger = ALT1.ASPMX.L.GOOGLE.com
mischlerandnurre.com MX preference = 5, mail exchanger = ALT2.ASPMX.L.GOOGLE.com
mischlerandnurre.com MX preference = 10, mail exchanger = ASPMX2.GOOGLEMAIL.com
mischlerandnurre.com MX preference = 10, mail exchanger = ASPMX3.GOOGLEMAIL.com
mischlerandnurre.com MX preference = 1, mail exchanger = ASPMX.L.GOOGLE.com
>
Google is involved somewhere, as is Exchange.
The name servers look odd as well - not only GoDaddy, but also something caled "justfree.com"
Simon.