Can send email but can't receive

I setup a mail using the domain @crunchhype.com. I set this up using the correct CNAME record on Namecheap. When I tried to send a test mail from my Gmail account it was not able to send and I got the following error;

Your message to xxx@crunchhype.com has been blocked. See technical details below for more information.

The response from the remote server was:

554 5.1.1 <xxx@crunchhype.com>: Recipient address rejected: undeliverable address: host mail-outgoing.relay-pe.svc.cluster.local[10.27.8.69] said: 554 5.7.1 <xxx@crunchhype.com>: Recipient address rejected: Access denied (in reply to RCPT TO command)