Publish your domain’s DMARC file to avoid phishing and spoofing. For those who’re using a shared IP account from a provider like SendGrid, don’t set up DKIM and DMARC. It forces your mail streams to have “domain alignment” that can cause your emails to fail authentication and begin bouncing. https://itsupport24444.thezenweb.com/the-5-second-trick-for-server-security-expert-64418535