Hello. I don't receive mails from my site. Get this error

Hello. I don’t receive mails from my site. Get this error -

ECDHE-ECDSA-AES128-GCM-SHA256:128 CV=yes: SMTP error from remote mail server after end of data: 550-5.7.26 Unauthenticated email from gmail.com is not accepted due to domain’s\n550-5.7.26 DMARC policy. Please contact the administrator of gmail.com domain\n550-5.7.26 if this was a legitimate mail. To learn about the DMARC initiative,\n550-5.7.26 go to\n550 5.7.26 Control unauthenticated mail from your domain - Google Workspace Admin Help i20-20020a05640242d400b005661b6a0aebsi4265994edc.162 - gsmtp

Do I understand correctly that you are using Google Workspace for your domain?

In that case, you need to follow their instructions to add the appropriate DNS records: Help prevent spoofing, phishing, and spam - Google Workspace Admin Help

You’ll want to follow the steps for SPF, DKIM and DMARC.

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