Email delivery
What are SPF, DKIM, and DMARC?
SPF identifies servers allowed to send for a domain. DKIM adds a signature that receiving systems can verify. DMARC checks alignment with the visible From domain and lets the domain owner publish a handling policy and receive reports. These controls support sender authenticity; they do not make unsolicited messages welcome or guarantee delivery.
How to approach it
- Inventory every legitimate service that sends for the domain.
- Follow each provider’s DNS setup and verify a real message.
- Review DMARC reports before enforcing a stricter policy.
Your business mailbox and transactional notification service may use different infrastructure. Configure both deliberately rather than copying a DNS record from an unrelated setup.
Sources and further reading
Updated September 10, 2026 · By Vibeful Team