Publish your domain’s DMARC record to avoid phishing and spoofing. When you’re using a shared IP account from the supplier like SendGrid, don’t create DKIM and DMARC. It forces your mail streams to have “domain alignment” that can result in your emails to fall short authentication and begin bouncing. https://lorenzobdaad.therainblog.com/26336228/powermtasend-email-can-be-fun-for-anyone