Unknown address error 550-'relaying denied

Set up email and followed all the steps, then tried to send email to it but it fails. Any ideas to correct this?

The following message to <contact AT adrenalinefastballDOTca>> was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-'relaying denied for <contact AT adrenalinefastballDOTca>

Reporting-MTA: dns; smtp-out-04.shaw.ca

Final-Recipient: rfc822;contact AT adrenalinefastballDOTca
Action: failed
Status: 5.0.0 (permanent failure)
Remote-MTA: dns; [63.250.193.253]
Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-'relaying denied for <contact AT adrenalinefastballDOTca>' (delivery attempts: 0)