Do I need both SPF and DKIM?
Using both improves resilience because forwarding can break SPF while a valid DKIM signature may survive. DMARC needs at least one aligned authentication method to pass.
WORKFLOW / DOMAIN EMAIL AUTHENTICATION
Check the controls behind the From address.
SPF authorizes sending infrastructure, DKIM verifies a cryptographic signature, and DMARC requires one of those identities to align with the domain visible to recipients.
01 /
Verify each independent control.
A passing record in one system does not compensate for a broken identity in another.
- Keep one valid SPF policy within its processing limits.
- Publish DKIM keys for the selectors actually used by senders.
- Route inbound mail through the intended MX providers.
- Use message headers to verify real authentication outcomes.
02 /
Use DMARC to connect the identities.
DMARC evaluates alignment with the visible From domain and publishes a handling policy for failures.
- Collect aggregate reports before tightening enforcement.
- Authenticate all legitimate third-party senders.
- Review subdomain and alignment modes.
- Progress toward quarantine or reject only after validating the sending estate.
03 /
Choose the signal you need.
FAQ /
Operational detail.
Is p=none secure?
It enables monitoring and reporting but does not request quarantine or rejection of failing messages.
Can public DNS prove a message passed?
No. Inspect the Authentication-Results header or sending-provider logs for the actual message outcome.