Publish your area’s DMARC record to stop phishing and spoofing. If you’re using a shared IP account from a service provider like SendGrid, don’t build DKIM and DMARC. It forces your mail streams to have “domain alignment” that could cause your emails to are unsuccessful authentication and begin bouncing. https://cashxfctu.thelateblog.com/27229927/server-security-expert-no-further-a-mystery