DMARC is a DNS record that tells receivers what to do with email that fails SPF or DKIM checks.
It closes the loop. SPF and DKIM prove mail is real. DMARC says: if it is not, reject it, quarantine it or just report it. Major mail providers now require it for bulk senders.
Start with a monitoring-only policy. It sends you reports without affecting delivery, so you can see who is sending as you.
Like the other email records, DMARC is outside the website change. It stays put when your Think Bright site goes live.
SPF is a DNS record that lists which servers may send email using your domain name.
DKIM adds a digital signature to your outgoing email so receivers can prove it was not altered.
An MX record tells the world which server receives email for your domain.
DNS is the phone book that turns your domain name into the address of the server that holds your site.
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