What is the name of the domain?
@nike4adventure
What is the error message?
Diagnostic-Code: smtp; 550-5.7.26 Unauthenticated email from bike4adventure.com is not accepted due to 550-5.7.26 domain’s DMARC policy. Please contact the administrator of 550-5.7.26 bike4adventure.com domain if this was a legitimate mail. To learn 550-5.7.26 about the DMARC initiative, go to 550 5.7.26 Control unauthenticated mail from your domain - Google Workspace Admin Help af79cd13be357-7c573cefbc8si1283974085a.391 - gsmtp
What is the issue you’re encountering
Reply email denied