Doesn't google check dkim and SPF records?
Sigh.
Edit - got around to reading the actual headers. gg rocket357. So sendgrid does indeed have dkim/SPF records (sendgrid.net's SPF includes sendgrid.biz, which has 173.193.132.0/23). Interesting. So sendgrid noticed it was a spoof, and bounced a return to the OP's inbox.
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Linux/Network-Security Engineer by Profession. OpenBSD user by choice.
Last edited by rocket357; 2nd February 2017 at 07:01 AM.
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