Configure and debug SPF, DKIM and DMARC DNS records for a sending domain. Use whenever the user mentions SPF, DKIM, DMARC, BIMI, email authentication, DNS records for email, "emails failing authentication", dmarc reports, p=none or p=quarantine or p=reject, SPF lookup limit, or is setting up a new sending domain. Also use when mail is being rejected or junked and the cause is unclear.
