Mail considered spam by server

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Hello,

I have had trouble since switching from Gmail through API to an SMTP server (with proper SPF/DKIM/DMARC settings). Using the PostSMTP mailer, I cannot send even a test e-mail. I get this: '' does not match the expected structure for a DNS hostname, '' does not appear to be a valid URI hostname, '' does not appear to be a valid local network name.

Switching to PHPmailer works fine to send the e-mail. They’re considered spam by the relay. I’m not sure yet it’s due to how PostSMTP formats the messages, so I’ll hold off complaining for now 😉

Wordpress is hosted on a Google cloud VM, and hostname returns instance-1.

Thanks,

Clément