A simple INternet search would have brought you to Wikipedia, where the following is stated on DNS Record Classes: The CLASS of a record is set to IN (for Internet) for common DNS records involving Internet hostnames, servers, or IP addresses. In addition, the classes Chaos (CH) and Hesiod (HS) exist.[34] Each class is an … Read more
That is odd. The sending source IP is definitely in your SPF, and the DMARC record includes aspf=r, so the header from address in a child domain is valid and matches. I’d also note that your DMARC has p=quarantine, but gmail is acting like it’s reject. This is gmail though, so you can’t expect it … Read more
Answer recommended by Twilio To set your mind at ease, your setup is fine! Nothing to worry about. DKIM is, among other things a reputation tool. SendGrid is adding two signatures to your emails, one for your domain, which will help pass DMARC authentication. And one for their domain / service. This second one is … Read more