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Reduce phishing risk with layers: authenticate mail sent using your organization’s domains, require phishing-resistant MFA where feasible, train people to verify unusual requests through a separate known channel, and make reporting and incident response routine. These controls address different parts of an attack; none makes every message safe.
What email authentication does—and what it does not do
SPF, DKIM, and DMARC help receiving mail systems assess whether a message claiming to come from a domain is authorized. NIST’s Guidelines for the Secure Exchange of Email (SP 800-177 Rev. 1, 2019) describes these mechanisms as part of trustworthy email. They perform different jobs:
| Control | What it checks or establishes | How it helps | Important boundary |
|---|---|---|---|
| SPF | Whether a sending host is authorized for a domain. | Gives a receiving system a way to check whether a mail source is authorized to send for that domain. | It does not verify the truth of message content or, by itself, establish that the visible From address is aligned with the authenticated domain. |
| DKIM | A cryptographic signature associated with a domain that a receiving system can check. | Lets the receiver check the signed message against the signing domain. | A valid signature does not mean the message is benign or that its claims are true. |
| DMARC | Whether SPF or DKIM authentication aligns with the domain shown in the visible From address, and what policy the domain owner publishes. | Lets a domain owner request a disposition for messages that fail DMARC and receive aggregate or failure reports. | It primarily addresses unauthorized use of the domain the organization controls; it does not stop every phishing route. |
DMARC enforcement can reduce direct spoofing of your organization’s domain. CISA recommends DMARC for incoming mail and a reject policy for an organization’s sent mail; a receiving system can reject messages that fail the published policy. The exact handling depends on receiving systems and correct configuration. DMARC does not block an attacker who uses an unrelated domain or a lookalike domain the organization does not control. Nor does a message that passes authentication become trustworthy: an attacker can send harmful content from a legitimate account or an authenticated domain.
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How to roll out domain authentication without disrupting legitimate mail
Treat enforcement as a managed change, not a DNS setting to switch on blindly. Mail administrators need to know every service that sends on the organization’s behalf, including third-party platforms and less-visible business systems.
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- Assign ownership and inventory sending sources. Name the policy owner, mail administrator, identity team, incident responders, and training lead. List organizational domains and subdomains, then identify the approved services and systems that send mail for each.
- Configure SPF and DKIM coverage. Document authorized mail sources, publish SPF records, and enable DKIM signing where supported. Confirm that legitimate messages pass authentication. Keep DNS ownership and record changes under review so new services are not added informally.
- Publish DMARC for visibility. Add a DMARC policy and a reporting destination. Review reports to find legitimate sending services that are missing from the inventory or failing alignment. Resolve those issues before tightening enforcement.
- Move toward enforcement. Increase the policy from monitoring to quarantine or reject as operational risk permits. CISA recommends a reject policy for spoof protection, but the organization should base the change on its verified sender inventory and observed results rather than assume every third-party sender is configured correctly.
Implementation details vary by mail provider and sending service. NIST SP 800-177 Rev. 1 is a foundational 2019 reference, not a guide to every current vendor-specific setting; check the current requirements of the services you use before changing DNS records or enforcement.
Pair email authentication with phishing-resistant sign-in
Domain controls do not protect a staff member who gives credentials to a convincing fake login page. Require MFA for email and privileged accounts, and prioritize methods designed to resist phishing. CISA identifies FIDO/WebAuthn as phishing-resistant. Number matching is an interim improvement where stronger MFA is not yet available, but it should not be treated as equivalent to phishing-resistant MFA.
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| Method | Phishing resistance | Practical planning point |
|---|---|---|
| FIDO/WebAuthn | CISA describes it as phishing-resistant. | Check compatibility with the organization’s accounts, devices, and applications, and plan enrollment and account recovery before broad deployment. |
| Number matching | An interim improvement over simple push prompts; not a substitute for phishing-resistant MFA. | Use it where stronger methods are not immediately available, while planning how to move users to phishing-resistant options. |
For staff who need a physical authenticator, a FIDO2-compatible hardware security key may be an option. Verify that it works with the organization’s identity provider and the user’s devices before deployment, and define a secure replacement and recovery process.
Train people to verify requests, not to hunt for typos
AI can make phishing messages more fluent and tailored, so spelling mistakes and generic greetings are unreliable as the center of a defense. NIST’s small-business cybersecurity guidance warns that AI can be used to craft increasingly convincing phishing attacks and advises taking a second or third look at messages asking for action. The practical lesson for policy teams is to teach a repeatable verification habit, not to imply that every AI-assisted message is detectable by its wording.
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Training should rehearse what to do when a message unexpectedly asks someone to open a link or attachment, enter credentials, change payment details, transfer funds, or disclose sensitive information:
- Pause before acting, especially when a request is urgent, unusual, or high-impact.
- Verify through a separate, previously known channel—for example, a saved phone number or established internal contact route. Do not use contact details or reply instructions supplied in the suspicious message.
- Report the message through the organization’s designated route, whether or not the person clicked, replied, or shared information.
- If someone has interacted with it, tell them to report that promptly and follow the organization’s response instructions rather than conceal the mistake or try to investigate alone.
Make the reporting route easy to find and non-punitive. CISA recommends regular training and realistic simulations; staff should know in advance how to report and what support to expect if they make a mistake.
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Measure whether training is changing behavior
A simulation click rate by itself does not show whether a workforce is proficient. NIST’s Phish Scale rates how difficult a simulated email is for people to detect, giving organizations context for interpreting exercise results. Use a mix of measures that reflect the behaviors and recovery steps the program is meant to improve:
- Reporting: whether people report suspicious messages, including messages they did not interact with.
- Time to report: how quickly a message reaches responders after delivery or discovery.
- Repeat outcomes: whether the same risky behavior recurs across exercises, considered alongside the difficulty of each simulation.
- Recovery actions: whether people who interact with a simulation or real message promptly report it and follow response directions.
Use realistic exercises that reflect the organization’s roles and workflows, but do not treat a single score as proof that staff are secure—or that they are not. A simulation is most useful when its difficulty and the response behavior are considered together.
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Make reporting part of incident response
A report is useful only if it reaches responders who can act on it. Define a route—such as a mail-client reporting button or monitored security mailbox—and ensure it is staffed and connected to the incident process. CISA emphasizes reporting so responders can determine whether an incident is isolated or broader.
Responders should be able to inspect message headers and URLs, search for the same message across mailboxes, block relevant indicators, and notify affected people. If someone submitted credentials or an account may be compromised, responders can determine whether to reset credentials or revoke sessions. The response should be based on the circumstances rather than assume every reported message requires the same action.
Keep the scope of the program clear
Email authentication protects the organization’s sending-domain identity; training and reporting help people handle suspicious mail from any source; MFA limits the impact of stolen credentials. Inbound filtering and monitoring, account security, and practiced incident response provide further layers. CISA’s generative-AI elections guidance is an official example of recommending authentication and phishing-resistant MFA for AI-enabled social engineering, but its focus is elections rather than every organization. The available guidance supports these controls as prudent measures; it does not establish a specific percentage reduction in phishing from combining them.
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