Publish your area’s DMARC report to avoid phishing and spoofing. For those who’re using a shared IP account from the supplier like SendGrid, don’t build DKIM and DMARC. It forces your mail streams to get “domain alignment” that can cause your emails to fail authentication and start bouncing. SendGrid https://it-support72072.like-blogs.com/26623322/send-bulk-emails-an-overview