DMARC
What is DMARC?
DMARC (Domain-based Message Authentication, Reporting and Conformance) is a DNS record that ties SPF and DKIM to the visible From address and tells receiving servers what to do when a message fails: nothing (p=none), send it to spam (p=quarantine) or reject it (p=reject). It can also request reports about who is sending mail as your domain.
Most domains start with p=none to collect reports, then tighten the policy once all legitimate senders pass.
Why DMARC matters
DMARC protects your domain from being used in phishing and improves deliverability. Large mailbox providers expect it from bulk senders.
DMARC example
A starting record: v=DMARC1; p=none; rua=mailto:dmarc-reports@example.com
Related marketing terms
An SPF record is a DNS entry listing which servers may send email for your domain, so receivers can reject forged messages.
DKIM (DomainKeys Identified Mail)
DKIM adds a cryptographic signature to your emails, published in DNS, so receivers can verify the email came from your domain unaltered.
Email deliverability is how reliably your emails reach the inbox rather than spam, shaped by authentication, reputation and content.