Google&#x27;s not particularly marking them invalid though?<p>The not-being-authenticated indicator is just replacing any avatar with a question mark (&quot;we&#x27;re not sure this person is this person&quot;) and a tiny indicator that warns you that outgoing mail is sent in the clear.<p>As long as you&#x27;re not sending mails to spam for this (which Google doesn&#x27;t seem to be doing, unless of course a DMARC policy tells them to - I imagine) then I don&#x27;t see the issue?