Hi guys, i try to configure a server with google smtp relay , to send and receive mails on mailcow. I am able to send not to receive. The configuration is a bit odd. The server FQDN and implicitly the mx for mail is not a google workspace domain, is an outside domain, but the domain added to be used for emails is. Can someone help me solve the issue, please ? I am getting Your message wasn’t delivered to firstname.lastname@example.org because the domain unfairedge.net couldn’t be found. Check for typos or unnecessary spaces and try again.
550 5.7.1 Invalid credentials for relay [2a00:1450:4864:20::22e]. The IP address you’ve registered in your Workspace SMTP Relay service doesn’t match the domain of the account this email is being sent from. If you are trying to relay mail from a domain that isn’t registered under your Workspace account or has empty envelope-from, you must configure your mail server either to use SMTP AUTH to identify the sending domain or to present one of your domain names in the HELO or EHLO command. For more information, please visit https://support.google.com/a/answer/6140680#invalidcred dv16-20020a170906b81000b009dd4820c4dasm1466977ejb.213 - gsmtp
error message. Mailcow server is installed on contabo, and i use Cloudflare for DNS management for both domains.